дано
m(CH3COOH) = 30 g
m(Mg) = 46 g
η((CH3COO)2Mg) = 85%
m прак ((CH3COO)2Mg)-?
M(CH3COOH) = 60 g/mol
n(CH3COOH) = m/M = 30 / 60 = 0.5 mol
M(Mg) = 24 g/mol
n(Mg) = m/M = 46 / 24 = 1.9 moL
n(CH3COOH) < n(Mg)
2CH3COOH+Mg-->(CH3COO)2Mg+H2
2n(CH3COOH) = n(CH3COO)2Mg
n(CH3COO)2Mg) = 0.5 / 2 = 0.25 mol
M((CH3COO)2Mg) = 142 g/mol
m теор ((CH3COO)2Mg) = n*M = 0.25 * 142 = 35.5 g
m прак ((CH3COO)2Mg) = 35.5 * 85% / 100% = 30.175 g
ответ 30.175 г
Объяснение:
дано
m(CH3COOH) = 30 g
m(Mg) = 46 g
η((CH3COO)2Mg) = 85%
m прак ((CH3COO)2Mg)-?
M(CH3COOH) = 60 g/mol
n(CH3COOH) = m/M = 30 / 60 = 0.5 mol
M(Mg) = 24 g/mol
n(Mg) = m/M = 46 / 24 = 1.9 moL
n(CH3COOH) < n(Mg)
2CH3COOH+Mg-->(CH3COO)2Mg+H2
2n(CH3COOH) = n(CH3COO)2Mg
n(CH3COO)2Mg) = 0.5 / 2 = 0.25 mol
M((CH3COO)2Mg) = 142 g/mol
m теор ((CH3COO)2Mg) = n*M = 0.25 * 142 = 35.5 g
m прак ((CH3COO)2Mg) = 35.5 * 85% / 100% = 30.175 g
ответ 30.175 г
Объяснение: