All categories

2 years ago

How many moles of air are there in a human lung with a volume of 2.4 L at STP? Explain your answer

1 answer:

5 0

One mole of any gas at STP is about 22.4 liters (even for mixtures). This number comes from the ideal gas equation by setting n=1 and STP conditions:
V=nR/P =1 mole x 0.08206Latm/molK x 237K/1atm = 22.4L

so jsut divide: 893L/22.4L/mole = 39.9 moles

You might be interested in

What is a mixture called when it has its different components mixed evenly within the substance? Heterogeneous mixture Homogeneo

larisa86 [58]

It would be considered a Homogeneous Mixture. A mixture with two or more components mixed evenly is a Homogeneous mixture.

3 0

3 years ago

Read 2 more answers

Calculate the moles and grams of solute in each solution. D. 2.0 L of 0.30M Na2SO4. I already have A, B, and C. Thanks!

e-lub [12.9K]

Find the number of moles
C = n / V
C(Concentration) = 0.30 moles / L
V ( Volume) = 2 L
n = ??
n = C * V
n = 0.30 mol / L * 2 L
n = 0.60 mol

Find the molar mass
2Na = 23 * 2 = 46 grams
1S = 32 * 1 = 32 grams
O4 = 16 * 4 = 64 grams
Total = 142 grams / mol

Find the mass
n = given mass / molar mass
n = 0.06 mol
molar Mass = 142 grams / mol
given mass = ???

given mass = molar mass * mols
given mass = 142 * 0.6
given mass = 85.2 grams.

85.2 are in a 2 L solution that has a concentration of 0.6 mol/L

4 0

2 years ago

Read 2 more answers

The coordination number of cation and anion in fluorite CaF2 and antifluorite Na2O are respectively

sp2606 [1]

8:4 and 4:8 both have CCP structure............................... ᐛ

6 0

3 years ago

Given a 0.200 M solution of anserine at its isoelectric point and ready access to 0.100 M HCl, 0.100 M NaOH and distilled water,

vekshin1

Solution :

Given :

Amount of anserine solution = 0.200 M

pH value is = 7.20

Preparation of 0.04 M solution of anserine from the 0.2 M solution.

0.2 M x $x$ = 0.04 M x 1000 ml

$x$ = 200 ml

So the 200 ml of 0.2 M anserine solution is required to prepare0.04 M of anserine.

0.1 M x $x$ = 0.04 x 1000 ml

$x$ = 400 ml

Therefore, 400 ml of HCl is needed.

6 0

2 years ago

1) Students set up the apparatus you see here to separate water into its two components: hydrogen and oxygen. The illustration a

zvonat [6]

Answer:

1) D; 2) B

Explanation:

1) Conservation of atoms

D is correct.

It has four atoms of H and two of O on each side of the reaction arrow.

A. Wrong. It has the same number of H and O on each side, but it has the wrong product. The reaction forms O₂ molecules, not O atoms.

B. Wrong. Atoms are balanced, but the products are incorrect.

C. Wrong. Atoms are balanced, but the reactants are incorrect.

===============

2) Chemical equations

B is correct.

The atoms are balanced, and the equation shows the correct formulas of the molecules.

A. Wrong. Atoms are balanced, and the formulas are correct, but the equation is not in its simplest form. The coefficients are not in their lowest terms. We must divide every coefficient by six to get the correct equation: H₂ + Cl₂ ⟶ 2HCl.

C. Wrong. The reactants are incorrect, and the equation is not in its lowest terms.

D. Wrong. The reactants are incorrect.

8 0

3 years ago