(1)题:
H2SO4 + Zn = ZnSO4 + H2↑
98 2
y 0.4
y=0.4 * 98 / 2 = 19.8 (克)
该硫酸溶液的溶质质量分数是:19.8 / 200 *100% = 9.8%
(2)题:设需98%硫酸 x 克
200 * 9.8% = 98% * x
x = 200*9.8% / 98% = 20 ( 克)
(1)题:
H2SO4 + Zn = ZnSO4 + H2↑
98 2
y 0.4
y=0.4 * 98 / 2 = 19.8 (克)
该硫酸溶液的溶质质量分数是:19.8 / 200 *100% = 9.8%
(2)题:设需98%硫酸 x 克
200 * 9.8% = 98% * x
x = 200*9.8% / 98% = 20 ( 克)