实验序号 | ① | ② | ③ |
V(盐酸)/ | 50.0 | 50.0 | 50.0 |
m(样品)/g | 1.90 | 3.80 | 5.70 |
448 | 672 | 448 |
下列说法正确的是
A.样品中的质量分数约为55.8% |
B.实验③溶液蒸干灼烧后所得固体为 |
C.盐酸的物质的量浓度 |
D.当样品质量约为时,产生最多,此时参加反应的 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2