дано
m(CH3Br) = 3.85 g
m(Na) = 1.15 g
V пр (C2H6) = 385.4 ml = 0.3854 L
η(C2H6)-?
2CH3Br+2Na-->C2H6+2NaBr
M(CH3Br) = 95 g/mol
n(CH3Br) = m/M = 3.85 / 95 = 0.04 mol
M(Na)= 23 g/mol
n(Na)= m/M = 1.15 / 23 = 0.05 mol
n(CH3Br) < n(Na)
2n(CH3Br) = n(C2H6)
n(C2H6) = 0.04 / 2 = 0.02 mol
Vтеор(C2H6) = n(C2H6) * Vm = 0.02 * 22.4 = 0.448 L
η(C2H6) = V пр(C2H6) / V теор(C2H6) * 100% = 0.3584 / 0.448 * 100% = 80%
ответ 80%
Объяснение:
дано
m(CH3Br) = 3.85 g
m(Na) = 1.15 g
V пр (C2H6) = 385.4 ml = 0.3854 L
η(C2H6)-?
2CH3Br+2Na-->C2H6+2NaBr
M(CH3Br) = 95 g/mol
n(CH3Br) = m/M = 3.85 / 95 = 0.04 mol
M(Na)= 23 g/mol
n(Na)= m/M = 1.15 / 23 = 0.05 mol
n(CH3Br) < n(Na)
2n(CH3Br) = n(C2H6)
n(C2H6) = 0.04 / 2 = 0.02 mol
Vтеор(C2H6) = n(C2H6) * Vm = 0.02 * 22.4 = 0.448 L
η(C2H6) = V пр(C2H6) / V теор(C2H6) * 100% = 0.3584 / 0.448 * 100% = 80%
ответ 80%
Объяснение: