A sample of hydrated sodium trioxocarbonate(IV), $\text{Na}_2\text{CO}_3 \cdot x\text{H}_2\text{O}$ , is heated strongly in a crucible until a constant mass is reached. If the salt loses $62.94\%$ of its initial mass as water vapor during heating, what is the integer value of $x$ ?
[Relative atomic masses: $\text{Na} = 23$ , $\text{C} = 12$ , $\text{O} = 16$ , $\text{H} = 1$ ]

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A sample of hydrated sodium trioxocarbonate(IV), $\text{Na}_2\text{CO}_3 \cdot x\text{H}_2\text{O}$ , is heated strongly in a crucible until a constant mass is reached. If the salt loses $62.94\%$ of its initial mass as water vapor during heating, what is the integer value of $x$ ?

[Relative atomic masses: $\text{Na} = 23$ , $\text{C} = 12$ , $\text{O} = 16$ , $\text{H} = 1$ ]

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