How many grams nano3 add to 500g of h20 prepare solution. 5 molal nano3?

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Chemistry

Dennis Randall

5 April, 13:57

How many grams nano3 add to 500g of h20 prepare solution. 5 molal nano3?

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Tyree Wall · Answer 1

Answer is: mass of sodium nitrate is 21,25 g.

m (H₂O) = 500 g · 1 kg/1000 g = 0,5 kg.

b (solution) = 0,500 m = 0,500 mol/kg.

m (NaNO₃) = ?

b (solution) = n (NaNO₃) : m (H₂O).

n (NaNO₃) = 0,500 mol/kg · 0,5 kg.

n (NaNO₃) = 0,25 mol.

m (NaNO₃) = n (NaNO₃) · M (NaNO₃).

m (NaNO₃) = 0,25 mol · 85 g/mol.

m (NaNO₃) = 21,25 g.