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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Na2S, NH4Cl.
1) Na2S + H2O ⇄ NaHS + NaOH
Полное ионное:
2Na(+) + S(2-) + H2O ⇄ Na(+) + HS(-) + Na(+) + OH(-)
Сокращенное:
S(2-) + H2O ⇄ HS(-) + OH(-)
2) NH4Cl + H2O ⇄ NH4OH + HCl
Полное:
NH4(+) + Cl(-) + H2O ⇄ NH4OH + H(+) + Cl(-)
NH4(+) + H2O ⇄ NH4OH + H(+)