Which of the following conduct electricity?

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is

0.499g 0f CuSO₄.xH₂O when heated to constant weight gave a residue of 0.346g. the value of x is? (Cu = 63.5, S = 32.0, O = 16, H = 1)

In the experiment, which of the following observations would suggest that a solid sample is a mixture? The

Hydrogen diffuses through a porous plug