Calculate the volume of a 35% nitric acid solution (density 1214 kg / m3) required to completely

| March 4, 2021 | education

Calculate the volume of a 35% nitric acid solution (density 1214 kg / m3) required to completely dissolve 0.08 kg of copper oxide (2)

1. Let’s compose the equation of the chemical reaction:

2HNO3 + CuO = Cu (NO3) 2 + H2O.

2. find the chemical amount of copper oxide:

0.08 kg = 80 g.

n (CuO) = m (CuO) / M (CuO) = 80 g / 80 g / mol = 1 mol.

3. According to the reaction equation, we find the chemical amount of nitric acid, and then its mass:

n (HNO3) = n (CuO) * 2 = 1 mol * 2 = 2 mol.

m (HNO3) = n (HNO3) * M (HNO3) = 2 mol * 63 g / mol = 126 g.

4. Find the mass of the nitric acid solution and its volume:

m (solution) = m (HNO3) * 100% / ω (HNO3) = 126 g * 100% / 35% = 360 g.

1214 kg / m3 = 1.214 g / ml.

V (solution) = m (solution) / ρ (solution) = 360 g / 1.214 g / ml = 296.54 ml.

Answer: V (solution) = 296.54 ml.



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