Question

A student heated (4.91x10^0) grams of calcium sulfate dihydrate. How many grams of water should be lost if the sample is heated correctly?

Answer 1

Question #54889 - Chemistry - Inorganic Chemistry

Question:

A student heated (4.91x10^0) grams of calcium sulfate dihydrate. How many grams of water should be lost if the sample is heated correctly?

Solution:

$$\begin{array}{c c} 4.91\,g & m - ? \\ \underline{\mathbf{CaSO_4}} \cdot 2\mathbf{H_2O} \xrightarrow{\mathbf{t}} \mathbf{CaSO_4} + 2\mathbf{H_2O} \uparrow \\ 172\,g/mol & 18\,g/mol \\ \hline \frac{4.91}{172} = 0.0285\,mol & 2 \times 0.0285 = 0.057\,mol \\ & m(\mathrm{H_2O}) = 0.057 \times 18 = 1.03\,g \\ \end{array}$$

Answer: $m(\mathrm{H_2O}) = 1.03\,g$

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