Answer:
45.4% of the compound is H20.
Step-by-step explanation:
First find the atomic masses of the elements in the compound: Co - 58.9, Cl - 35.5, H - 1.0, and O is 16.0. Then find the mass of the hydrate (6H20) which is 108 g (6×((2×1.0)+16.0)). Then find the mass of the compound (CoCl2 · 6H20) which is 237.9 g (58.9 + (35.5 × 2) + 108). Then divide the mass of the hydrate by the mass of the compound and multiply the answer by 100% to get your answer of 45.4%.