Air is a mixture of several gases, where the two most dominant components in dry air are 21 vol% oxygen and 78 vol% nitrogen. Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar mass of 14.0067 g/mol. Since both of these elements are diatomic in air - O2 and N2, the molar mass of oxygen gas is 32 g/mol and the molar mass of nitrogen gas is 28 g/mol.
The average molar mass is equal to the sum of the mole fractions of each gas multiplied by the molar mass of that particular gas:
Mmixture = (x1*M1 + + xn*Mn) (1)
where
xi = mole fractions of each gas
Mi = the molar mass of each gas
The molar mass of dry air is 28.9647 g/mol. Composition and content of each gas in air is given in the figures and the table
Объяснение:
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Объяснение:
ZnS+ 2HCl→ZnCl2+H2S↑
Mr(ZnS)=97 g
1 mol ZnS (97g) 1 mol H2S (22.4 litr)
Xg ZnS12,4 litr
m(teoret.ZnS)=12.4*97/22.4=53,7 g
massa texnicheskogo ZnS
m(texn.ZnS) =m(teoret.ZnS) / ω (ZnS) /η= 53,7/(1-0,1) /0,85=70 g