实验次数 | 1 | 3 | 4 | 5 | 6 |
取样品质量(g) | 25.0 | 25.0 | 25.0 | 25.0 | 25.0 |
取稀盐酸质量(g) | 50.0 | 120.0 | 140.0 | 160.0 | 205.0 |
产生气体质量(g) | 0 | a | 2.2 | 3.3 | 4.4 |
(1)a的数值为
(2)第6次实验,所得溶液中溶质的化学式为
(3)计算25克样品中碳酸钙的质量分数
(4)列式计算所用盐酸的溶质质量分数(保留到0.1%)(写出解题过程)
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