A container that measures 20.0 cm wide, 10.0 inches long, and 0.450 meters long is filled with air at a temperature of 273 K, and 1.00 atm of pressure.
a. How many moles of nitrogen are in it?
b. How many grams of oxygen are contained in it?
GAS LAW CHEM QUESTION!?
2016-04-06 5:47 am
回答 (2)
2016-04-06 6:53 am
(a)
P = 1.00 atm
V = 20.0 × 25.4 × 45 cm³ = 22860 cm³ = 22.86 L
n = ? mol
R = 0.0821 atm L / (mol K)
T = 273 K
PV = nRT
n = PV/(RT) = 1.00 × 22.86 / (0.0821 × 273) = 1.02 mol
Air contains 80% of N₂.
No. of moles of N₂ = 1.02 × 80% = 0.816 mol
(b)
Air contains 20% of O₂.
No. of moles of O₂ = 1.02 × 20% = 0.204 mol
Molar mass of O₂ = 16.00× 2 = 32.00 g/mol
Mass of O₂ = 32.00 × 0.204 = 6.53 g
P = 1.00 atm
V = 20.0 × 25.4 × 45 cm³ = 22860 cm³ = 22.86 L
n = ? mol
R = 0.0821 atm L / (mol K)
T = 273 K
PV = nRT
n = PV/(RT) = 1.00 × 22.86 / (0.0821 × 273) = 1.02 mol
Air contains 80% of N₂.
No. of moles of N₂ = 1.02 × 80% = 0.816 mol
(b)
Air contains 20% of O₂.
No. of moles of O₂ = 1.02 × 20% = 0.204 mol
Molar mass of O₂ = 16.00× 2 = 32.00 g/mol
Mass of O₂ = 32.00 × 0.204 = 6.53 g
2016-04-06 5:49 am
if the cuckold has a penis under 13 inches, he is a true cuckold
收錄日期: 2021-05-02 11:19:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160405214759AAzQhaH