Choose the answer that correctly completes the statement: At 0∘C and 0.500 atm, 4.48 LNH3(g) a)...
Choose the answer that correctly completes the statement: At 0∘C and 0.500 atm, 4.48 LNH3(g)
| a) contains 0.20 mol NH3 |
| b) has a mass of 3.40 g |
| c) contains 6.02×1022 molecules |
| d) contains 0.40 mol NH3 |
Homework Answers
Given:
P = 0.5 atm
V = 4.48 L
T = 0.0 oC
= (0.0+273) K
= 273 K
find number of moles using:
P * V = n*R*T
0.5 atm * 4.48 L = n * 0.08206 atm.L/mol.K * 273 K
n = 0.1 mol
Molar mass of NH3,
MM = 1*MM(N) + 3*MM(H)
= 1*14.01 + 3*1.008
= 17.034 g/mol
use:
mass of NH3,
m = number of mol * molar mass
= 0.1 mol * 17.03 g/mol
= 1.70 g
Number of molecule = number of mol * Avogadro’s number
= 0.1 mol * 6.02*10^23 molecules/mol
= 6.02*10^22 molecule
Answer: c
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