化学200g9.8%的稀硫酸与足量的锌粒反应 。(1)问生产氢气多少克?(2)这些气体所含分子数多少?帮帮忙
2013-09-12
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1)
Zn + H2SO4 == ZnSO4 + H2
m(H2SO4) = 200*9.8% = 19.6g
n(H2SO4) = 19.6/98 = 0.2mol
所以生成的n(H2) = 0.2mol
m(H2) = 0.2 * 2 = 0.4g
(2)
N = 0.2 * NA = 1.204*10^24 个
(3)
V = 0.2 * 22.4 = 4.48L
所以需准备集气瓶 = 4.48/0.5 = 8.96
所以要9个集气瓶
Zn + H2SO4 == ZnSO4 + H2
m(H2SO4) = 200*9.8% = 19.6g
n(H2SO4) = 19.6/98 = 0.2mol
所以生成的n(H2) = 0.2mol
m(H2) = 0.2 * 2 = 0.4g
(2)
N = 0.2 * NA = 1.204*10^24 个
(3)
V = 0.2 * 22.4 = 4.48L
所以需准备集气瓶 = 4.48/0.5 = 8.96
所以要9个集气瓶
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