Answer:
623 kgm^-3
Explanation:
Density = Mass/Volume
Mass = 1209 kg
Volume = 1.94 m^3
Density = 1209 / 1.94 kgm^-3
= 623.1958763 kgm^-3
= 623 kgm^-3 (3sf)
In order to prepare a sample for absorbance readings, a vitamin tablet containing 25 mg of iron was dissolved in 6M HCl, quantitatively transferred into a 100 mL volumetric flask and diluted to the 100 mL mark with DI water. Then 20 mL and 17 mL of this solution were pipetted into separate 100 mL volumetric flasks and each of these was brought up to 100 mL volume by diluting with DI water to the mark.
Required:
Calculate concentration of iron in mg/L in each of these flasks
Answer:
C₂ = 50 mg/L
C₃ = 42.5 mg/L
Explanation:
To do this, we just need to use the following expression:
C₁V₁ = C₂V₂ (1)
Where:
C₁: Original concentration of the Iron solution (mg/L)
V₁: aliquot of the iron solution (mL or L)
C₂: Concentration of the iron after beind dilluted (mg/L)
V₂: Volume of the flask that's being used.
Using the above expression, we just solve for C₂:
C₂ = C₁V₁ / V₂ (2)
We have the required volumes, but we do not have the concentration of the iron solution (C₁). To determine this, we use the initial flask of 100 mL and the mass of the iron:
C₁ = 25 mg / 0.1 L = 250 mg/L
With this value, we can replace in (2) to get the concentration on each flask.
Flask 1:
We have an aliquot of 20 mL, and it was dilluted to 100 mL, the concentration would be:
C₂ = 250 mg/L * (20/100)
C₂ = 50 mg/LFlask 2:
We have an aliquot of 17 mL dilluted to 100 mL so:
C₃ = 250 * (17/100)
C₃ = 42.5 mg/LHope this helps
The concentration of iron in mg/L in each of the two flasks is 50 mg/l and 42.5 mg/L respectively.
The initial concentration of iron in the sample is obtained as follows:
A vitamin tablet containing 25 mg of iron is dissolved in 6M HCl and then made up to 100 mL in a 100 mL volumetric flask with DI water.
Concentration of iron in the solution = 25 mg/ 100 mL
Converting to mg/L; 1 L = 1000 mL, then 100 mL = 1000 * 1 L/ 1000 mL = 0.1 L
Concentration of iron in the solution in mg/L = 25 mg / 0.1 L = 250 mg/L
Then 20 mL and 17 mL of this solution were pipetted into separate 100 mL volumetric flasks and each of these was brought up to 100 mL volume by diluting with DI water to the mark.
Using the dilution formula C₁V₁ = C₂V₂ to determine the concentration of iron in each of these flasks:
C₁ = initial concentration; V₁ = initial volume
C₂ = final concentration; V₂ = final volume
Flask 1:
C₁ = 250 mg/L, V₁ = 20 mL, C₂ = ?, V₂ = 100 mL
C₂ = C₁V₁ / V₂
C₂ = 250 * 20 / 100
C₂ = 50 mg/L
Flask 2:
C₁ = 250 mg/L, V₁ = 17 mL, C₂ = ?, V₂ = 100 mL
C₂ = C₁V₁ / V₂
C₂ = 250 * 17 / 100
C₂ = 42.5 mg/L
Therefore, the concentration of iron in mg/L in each of the two flasks is 50 mg/l and 42.5 mg/L respectively.
Learn more: https://brainly.com/question/6103588
Nitrogen is important for _____. plant growth weather and temperature animals to breathe photosynthesis
Answer:
building amino acids in proteins
Explanation:
Pls help I need a good grade
Answer:
Option 2
Explanation:
8KCIO3 +1C12H22011
- >12CO2 + 11H20 + 8KCI
If you want the gummy bear to be the limiting reactant
for the reaction above, what is the minimum
amount of potassium chlorate that must be used to react completely with one gummy bear?
note: gummy bears are many made up of sucrose (1.1 g of sucrose in this equation)
3.2 g KClO3
Explanation:
1.1 g C12H22O11 × (1 mol C12H22O11/342.3 g C12H22O11)
= 0.0032 mol C12H22O11
0.0032 mol C12H22O11 × (8 mol KClO3/1 mol C12H22O11)
= 0.026 mol KClO3
Therefore, the minimum amount of KClO3 needed is
0.026 mol KClO3 × (122.55 g KClO3/1 mol KClO3)
= 3.2 g KClO3
Plz help ASAP
What is the molarity of a 0.6 L solution that contains 50.0 grams of sodium hydroxide(NaOH)?
A) 2.1 M
B) 2.9 M
C) 3.3 M
Answer: A 2.1
Explanation:
Balance the following chemical equation:
Br2+
Nal-
NaBr
+
Answer:
2 NaI (aq) + Br2 (aq) → 2 NaBr (aq) + I2 (s)
This is an oxidation-reduction (redox) reaction:
2 Br0 + 2 e- → 2 Br-I
(reduction)
2 I-I - 2 e- → 2 I0
(oxidation)
How many atoms of oxygen are included in one glucose molecule?
Answer:
6 atoms of oxygen are included.
Explanation:
Saw a similar answer
Also
Have a great day :D
Answer:
6 atoms are included :)
Explanation:
1 molecule of glucose contains 6 atoms
The half-life of Po-218 is three minutes. How much of a 2.0 gram sample remains after 15 minutes? Suppose you wanted to buy some of this isotope, and it required half an hour for it reach you. How much should you order if you need to use 0.10 gram of this material?
(2)(½^(15/3)) = 0.0625 (5 half-lives) 102.4 grams order
What is the half-life of an isotope?A radionuclide's half-life is the amount of time it takes for half of its radioactive atoms to decay. A good rule of thumb is that you will have less radiation than 1% of the original amount after seven half-lives.Knowing an element's alpha, beta, or gamma decay can help someone properly protect their body from excessive radiation. Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half.Each radioisotope has a set half-life that can be anywhere between a few milliseconds (for example, 215At at 0.1 milliseconds) and billions of years (e.g.,238U at 4.468 billion years). Both stable and radioactive isotopes can exist for an element.The period of time needed for something to go from 50% to 50%To learn more about half-life of an isotope refers to:
brainly.com/question/25917167
#SPJ1
70.8 g of CO is exposed 20.4 g of Hy and a reaction takes place.
CO + 2H2 - CH3OH
1. How many grams of methyl hydroxide (CH3OH) is produced?
2. What is the limiting reactant?
3. How much of the excess reactant is left unused?
literally what does any of this mean
Answer:
1. 80.9 g of CH₃OH
2. CO
3. 5.14moles
Explanation:
The reaction is:
CO + 2H₂ → CH₃OH
First place, we determine the moles of each reactant.
70.8 g . 1mol/ 28g = 2.53 moles of CO
20.4 g . 1mol / 2g = 10.2 moles of H₂
There is too much hydrogen, so the limiting reactant might be the carbon monoxide.
2 moles of H₂ react to 1 mol of CO
Then, 10.2 moles of H₂ may react to (10.2 . 1) /2 = 5.1 moles
We don't have enough CO, so it's ok that CO is the limiting. (We have 2.53 moles, we need 5.1 moles)
In the other hand, hydrogen is the excess reactant.
1 mol of CO react to 2 moles of hydrogen
2.53 moles may react to (2.53 . 2) /1 =5.06 moles
We have 10.2 moles, and we need 5.06 moles. Then (10.2 - 5.06) = 5.14 moles remains after the reaction goes complete.
Now that we know the limiting reactant, we can determine the grams of produced methanol. Ratio is 1:1
1 mol of CO produces 1 mol of CH₃OH
2.53 moles of CO must produce 2.53 moles of CH₃OH
We convert moles to mass: 2.53 mol . 32 g/mol = 80.9 g
The Law of Conservation of Matter states that in a closed system, matter cannot be created or destroyed. This means that atoms can NOT just appear or disappear. The mass will not change in a closed system.
This, however, is NOT what we observed. We observed that the mass of the substance in our measuring tray increased after burning.
Why do you think this happened? Where did the extra mass come from?
REMEMBER: Energy (light, heat, motion, etc.) is not made of atoms so has no mass.
RESOURCE: Access your online textbook through CLEVER, click to get the blue ribbon across the top of the page and go to the Table of Contents. Scroll down to Lesson 9 Conservation of Matter and select "Extending Your Knowledge: Mass and Matter"
Answer:
The Law of Conservation of Matter states that in a chemical reaction, matter is not created or destroyed. However, it is possible for the mass of a substance to change during a chemical reaction, as you observed.
When a substance burns, it reacts with oxygen in the air to form new compounds. For example, when wood burns, it reacts with oxygen to form water and carbon dioxide. The mass of the wood plus the mass of the oxygen is equal to the mass of the water and carbon dioxide produced.
In this case, the extra mass that you observed came from the oxygen that reacted with the wood. Oxygen has mass, and when it reacts with the wood, the mass of the resulting compounds is greater than the mass of the starting materials.
It's important to note that energy is not a form of matter, and therefore has no mass. However, energy can be converted into matter and vice versa, according to the famous equation E=mc^2, where E is energy, m is mass, and c is the speed of light. This equation demonstrates that mass and energy are fundamentally connected and can be converted into each other under certain conditions.
Explanation:
If 467.08 grams of Oz are reacted, how many grams of C6H5CH3 will also be reacted?
In order to react with 467.08 grams of O2, 4034.95 g of toluene (C6H5CH3) is required.
What are some uses for toluene?Toluene is a white liquid hydrocarbon found in petroleum and coal tar that is employed like a solvent and in the synthesis of organic compounds. Toluene is a naturally occurring substance found in crude oil and is used for oil refining as well as the production of glues, lacquers, paints, and explosives. Toluene can be discovered in household products like paint, paintbrush cleaner, nail polish, glue, inks, and stain removers.
For the balanced equation
2C6H5CH3 + 3O2 → 7CO2 + 4H2O
We required three steps
1.) Convert mass of O2 to mol of O2
mole = mass / molar mass
2.) Find mole of C6H5CH3 by multiply mol O2 by the mol ratio between O2 and C6H5CH3 in balanced equation.
3.) Find mass C6H5CH3 by multiply mol C6H5CH3 by its molar mass (92.14 g/mol)
= 467.08 gm /15.999 gm × 3/ 2 ×92.14 gm
= 4034.95 gm. of C6H5CH3
To know more about Toluene visit :
https://brainly.com/question/6181289
#SPJ1
I need help with this question...
What is the molecular weight of (NH4)2SO4
The molecular weight of [tex](NH_4)_2SO_4[/tex] would be 132 g/mol.
Calculation of molecular weightsThe molecular weight, otherwise known as the molar mass of substances is the sum of the molar weights of individual atoms that make up the substance.
[tex](NH_4)_2SO_4[/tex] is made up of 2 atoms of N, 8 atoms of H, 1 atom of S, and 4 atoms of O.
Molar weight of N is 14 g/molMolar weight of H is 1 g/molMolar weight of S is 32 g/molMolar weight of O is 16 g/molThus, the molecular weight of [tex](NH_4)_2SO_4[/tex] = (14x2) + (1x8) + 32 + (16x4)
= 132 g/mol
In other words, the molecular weight of [tex](NH_4)_2SO_4[/tex] is 132 g/mol.
More on molecular weights can be found here: https://brainly.com/question/14507491
#SPJ1
why is it important for a consumer to know the properties of a textile fibre
A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently. It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities.
Understanding why some fabrics are more durable and so more suited for particular uses comes from studying textiles. It permits one to comprehend the rationale behind why particular materials generate cool-looking clothing in addition to creating the sense of coolness when used as décor. A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently.
It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities. Although clothes don't necessarily make a person, they certainly help to develop a positive personality and a sense of self-assurance. Housewives should therefore be familiar with clothing and textiles to obtain the best out of it.
To learn more about clothing and textile from given link
https://brainly.com/question/18411505
#SPJ1
What are the similarities and differences between ionic and covalent bonds?
During a laboratory experiment, 46.54 grams of Al2O3 was formed when O2 reacted with aluminum metal at 300.0 K and 1.2 atm. What was the volume of O2 used during the experiment?
3O2 + 4Al → 2Al2O3
a
12.51 liters
b
11.67 liters
c
10.19 liters
d
13.96 liters
Please help, Thanks
Answer:
13.96
Explanation:
sorry, too lazy to give the explanation, hopefully someone else will come along and give the proper explanation
Answer: 13.96 liters
Which of the following is an oxidation-reduction reaction?
A) HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l)
B) NaI(aq) + AgNO3(aq) → AgI(s) + NaNO3(aq)
C) Pb(C2H3O2)2(aq) + 2 LiBr(aq) → PbBr2(s) + 2 LiC2H3O2(aq)
D) Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g)
E) All of the above are oxidation-reduction reactions.
Answer:
D) Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g)
Explanation:
In a redox reaction, One atom is gaining electrons (Reduction) whereas other is loosing electrons (Oxidation). In the reactions:
A) HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l)
As sodium is always +1 and Br always -1, this is not a redox reaction.
B) NaI(aq) + AgNO3(aq) → AgI(s) + NaNO3(aq)
Sodium is always +1 and nitrate ion is -1. This is not a redox reaction
C) Pb(C2H3O2)2(aq) + 2 LiBr(aq) → PbBr2(s) + 2 LiC2H3O2(aq)
Acetate ion, C2H3O2 is -1 as Br is -1, lithium is +1 and Pb +2, This is not a redox reactoin
D) Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g)Barium is 0 as Ba(s) but +1 as BaCl2. Is oxidizing
Hydrogen is +1 as HCl but 0 as H2. Is reducting.
This reaction is an oxidation-reduction reaction
What do the observations for changes to volume and pressure show you about the
relationship between the volume and pressure of a gas? Explain using the data! Does
this demonstration support Boyle's Law or not?
(Hint: pressure is not being measured in this video, but think what would happen to a
balloon if it was squeezed or compressed. Would it get larger or smaller?)
Answer: The given demonstration does not support Boyle's Law.
Explanation:
According to Boyle's law, at constant temperature the pressure of an ideal gas is inversely proportional to the volume of gas.
[tex]P \propto \frac{1}{V}[/tex]
Therefore, an increase in volume of gas will lead to a decrease in pressure and vice-versa.
Now, according to the given data of volumes there is occurring an increase on moving from final volume 1 to final volume 3. This means that pressure is decreasing.
As a result, if a balloon was squeezed or compressed then it would get smaller. But in the given demonstration pressure is not given.
Thus, we can conclude that the given demonstration does not support Boyle's Law.
I NEED HELP MY QUESTION IS "which of the following is a structural adaptation used to help animals move"
A: lungs
B: fur
C: wings
D: gills
Answer:
wings
Explanation:
this is an example of movement because it allows birds to fly in the air
PLEASE HELPPP ME
Use the following balanced chemcial equation to answer the question below.
CaBr2 + Na2SO4 --> CaSO4 + 2NaBr
1. How many moles of sodium bromide can be made from 5 moles of calcium bromide
2. How many grams of calcium sulfate will be made from 2.00 moles of calcium bromide
3. How many grams of calcium bromide will be needed to make 845 grams of calcium sulfate
Answer:
1) (5 moles of calcium bromide) x 2 / 1 = 10 moles
2) (2.00 moles of calcium bromide) = 2.00 moles of calcium sulfate
so (2.00) x (136.1 g/mol) = 272.2 g
3) (845 grams of calcium sulfate) / 136.14 g/mol = 6.21 moles
6.21 moles of calcium sulfate = 6.21 moles of calcium bromide
(6.21 moles of calcium bromide) x 199.89 g/mol = 1241.32 g
The molar solubility of calcium sulfide in a 0.222 M sodium sulfide solution is:________-
HELP ME PLS
type an actual answer insted of saying I will help you
Answer:
develops,blossoms are synonyms
Which fuels are non-renewable
Answer:
fossil fuels
Explanation:
Well I had some topics on this stuff last quarter in science and from what I can remember it should be fossil fuels I think that fossil fuels are technically renewable but they are considered non-renewable since they are either in small supplies, are hard to obtain or take a long time to form.
Pls help due tommorow
Answer:
.
Explanation:
a. 2, 2
b. 2, 2
c. 2, 3, 2
d. 1, 5, 3, 4
Just make sure there is an equal amount of each ELEMENT on each side of the reaction. Starting with, O, H, C, then other elements is a good method too
How many moles of gas are present if P=1atm, V=1L, T=1K?
it depends on the chemical's molar mass
O.12
8.314
01
The number of moles of the ideal gas is 0.12 moles. Option A
What is the number of moles?In the context of the problem that we have here, we are looking at the ideal gas equation. When we look at the idea gas equation, we can tell that we would have the pressure of the gas, the volume of the gas as well as the temperature of the gas in view as is the case that we have here.
Thus, the idea that we are asked to pass across in the question is that we should be able to find out the number of moles that we have in the compound that have the variables that have been listed here.
Pressure (P) = 1 atm
Volume (V) = 1 L
Temperature (T) = 1 K
Number of moles (n) = ?
Using;
PV = nRT
n = PV/RT
n = 1 * 1/0.082 * 1
n = 0.12 moles
The moles of the gas is 0.12 moles.
Learn more about ideal gas:https://brainly.com/question/28257995
#SPJ1
5. Given the following unbalanced equation: N20(g) + O2(g) → NO2(g)
Answer:
2 N2O(g) + 3 O2(g) --> 4 NO2(g)
Explanation:
this is the chemical reaction balanced, if that was ur question.
34.1 g sodium nitrate is dissolved in water to
make 816 g of solution.
What is the percent sodium nitrate in the
solution?
1. 4.36117%
2. 4.17892%
3. 100%
4. 0.0117892%
Answer:
2.4.17892
Explanation:
34.1/816×100=4.17892
How many grams are in 4.2 × 10²² atoms of iron?
Answer:0.226 gram
Explanation:you can get the answer in two steps calculate 3.40 . 10^22 atoms =
Answer:
4.2 × 10²² ÷ 6.022× 10²³
4.2 × 10²² equals 0.069 moles (approx)
weight of 1 mole of iron = 56g
therefore, 0.069 moles = 56 × 0.069 = 3.9 g
Sorry for lazy work.. :P
the maximum allowed concentrations of chloride in municipal drinking water supply in 250 ppm cl. when the supply of water exceeds this limit it often has a distinctive salty taste. what is the concentration in molarity?
The allowed concentration of Cl in water is 250 ppm. Then the equivalent concentration in molarity is 0.007 molar.
What is molarity ?Molarity is a common term used to express the concentration of a solution. It is the ratio of the number of moles of solute to the volume of solution in liters. Molarity is a temperature dependent measurement.
Parts per million is another term of concentration have the formula as written below:
ppm = ws/W × 10⁶
Where, ws is the weight of solute and W be the weight of solution in grams.
1 molar = 35500 ppm
therefore, 250 ppm = 250 ppm × 1M /35500 ppm = 0.007 M.
Hence, the molarity of the salt solution will with the maximum allowed concentration will be 0.007 M.
Find more on molarity:
https://brainly.com/question/8732513
#SPJ1
explain how dna which is 6 feet long, can be stored in the nucleus of a tiny human cell.
Answer:
Packed inside the nucleus of every human cell are nearly 6 feet of DNA, which is divided into 46 individual molecules, one for each chromosome and each about 1.5 inches long. Packing all this material into a microscopic cell nucleus is an extraordinary feat of packaging.
Explanation:
Packed inside the nucleus of every human cell are nearly 6 feet of DNA, which is divided into 46 individual molecules, one for each chromosome and each about 1.5 inches long. Packing all this material into a microscopic cell nucleus is an extraordinary feat of packaging. For DNA to function, it can't be crammed into the nucleus like a ball of string. Instead, it is combined with proteins and organized into a precise, compact structure, a dense string-like fiber called chromatin.
(hope this helps can i plz have brainlist :D hehe)