Washing soda has the formula Na₂CO₃.10H₂O. What mass of anhydrous sodium carbonate is left when all the water of crystallization is expelled by heating 57.2 g of washing soda?

17.4 g

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14.6 g

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28.3 g

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21.2 g

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42.8 g

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Solution

The correct option is D
21.2 g

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Similar questions

(a) If 112 cm³ of hydrogen sulphide is mixed with 120 cm³ of chlorine at STP, what is the mass of sulphur formed?
H₂S + Cl₂ $\overset{}{\to}$ 2HCl + S
(b) Washing soda has the formula Na₂CO₃·10H₂O. What is the mass of anhydrous sodium carbonate left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
(c) When excess lead nitrate solution was added to a solution of sodium sulphate, 15.1 g of lead sulphate was precipitated. What mass of sodium sulphate was present in the original solution?
Na₂SO₄ + Pb(NO₃)₂ $\overset{}{\to}$ PbSO₄ + 2NaNO₃
(H = 1; C = 12; O = 16; Na = 23; S = 32; Pb = 207)