1. Let’s compose the equation of the chemical reaction:
CuO + 2HNO3 = Cu (NO3) 2 + H2O.
2. Find the chemical amount of copper oxide and nitric acid:
n (CuO) = m (CuO) / M (CuO) = 16 g / 80 g / mol = 0.2 mol.
m (HNO3) = m (solution) * ω (HNO3) / 100% = 200 g * 20% / 100% = 40 g.
n (HNO3) = m (HNO3) / M (HNO3) = 40 g / 63 g / mol = 0.634 mol.
3. According to the reaction equation, we find the chemical amount, and then the mass of copper nitrate:
! CuO is in short supply.
n (Cu (NO3) 2) = n (CuO) = 0.2 mol.
m (Cu (NO3) 2) = n (Cu (NO3) 2) * M (Cu (NO3) 2) = 0.2 mol * 188 g / mol = 37.6 g.
Answer: m (Cu (NO3) 2) = 37.6 g.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.