CH-1995

Empirical and molecular formulae

Chemistry · Secondary 4 · Hard · Empirical and molecular formulae

A student heats 3.62 g of

\text{Na}_2\text{CO}_3 \cdot x\text{H}_2\text{O}

strongly until its mass becomes constant at 2.65 g. What is the value of

x

[M_r(\text{Na}_2\text{CO}_3) = 106,\ M_r(\text{H}_2\text{O}) = 18]

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