Question

Un compus organic A, si anume C2H7N, sau CH3-NH-CH3 are densitatea fata de aer egala cu 1,557.
 1) Sa se calculeze masa de compus A care contine 2,8 g de azot.
2) Sa se calculeze masa unei probe de compus A care ocupa la 47 grade celsius si 2 atmosfere un volum de 1312 L.

Answer 1

1) MC2H7N=45g/mol

45g C2H7N..........................14g N
x=..........................................2,8g N
x=2,8*45/14=9g C2H7N

2) T=273+47=320K

pV=m/M*R*T => m=pVM/RT=2*1312*45/0,082*320= 118080/26,24=4500g=4,5kg

Answer 2

a)45 g C2H7N........14 g N
x.............................2,8 g N
x = 9 g

b)pV=nRT
n = 1312*2/0.082*320 = 100 moli C2H7N
m = n * masa molara = 100 * 45 = 4500 g