A solution of HNO3 is 5%(w/w) .Find the mass of HNO3 present in 100ml of solution (density of solution =1.4g/ml)
Answers
this is easy way and the correct method
7g of HNO₃ present in 100 ml of solution.
A solution of HNO₃ is 5% (w/W).
We have to find the mass of HNO₃ present in 100ml of solution (density of solution = 1.4 g/ml).
Here, A solution of HNO₃ is 5% (w/W), It means, 5g of HNO₃ is present in 100g of solution.
Density of solution is 1.4 g/ml [ 1 cm³ = 1 ml ∴ 1 g/cm³ = 1g/ml ]
∴ volume of solution = mass of solution/density of solution
= 100g/1.4g/ml = 71.428 ml
∴ 5g of HNO₃ is present in 71.428 ml of solution.
∴ 5/71.428 × 100g = 7 g of HNO₃ is present in 100ml of solution.
Therefore 7g of HNO₃ present in 100ml of solution.
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