how do I get these answers? 8. What is the density of carbon dioxide o C and 2.0

Question

how do I get these answers?

8. What is the density of carbon dioxide o C and 2.00 atm pressure? gas at 3.93 c. 5.90 g/L, d. 7.86 g/L e. none of the above 9. The combustion of carbon monoxide yields carbon dioxide 2 CO(g) O2 (g) 2 CO2 (g) The volume of oxygen gas needed to produce 22 grams of carbon dioxide at STP is 11 L d. 22 L e. 32 L. 10. What is the partial of nitrogen in a container that contains 2.0 mol of oxygen,30 mol of pressure dioxide the total pressure is 900 and 1.0 mol of carbon when a. 150 torr b. 200 torr c. 30 d. 450 torr 600 torr

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There are multiple questions here . i am allowed to answer only 1 at a time. I will answer 1st one for you. Please ask other as different question

8.
P = 2 atm
R = 0.0821 atm-L / mol-K
T = 0 oC = (0 + 273) K = 273 K
Molar mass of CO2 = 12 + 2*16 = 44 g/mol
use:
p*V=n*R*T
p*V=(mass/molar mass)*R*T
p*molar mass=(mass/V)*R*T
p*molar mass=density*R*T
2*44 = density * 0.0821 * 273
density = 3.93 g/L
Answer: b

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