4. Copper(II) nitrate decomposes on heating according to the equation: 2Cu(NO3)2(s) 2Cu0(s) + 4NO2(g) + O2(g) After decomposition of a sample of copper(II) nitrate, 7.04 g of black copper(II) oxide remains. a. Calculate the original mass, in g, of copper(II) nitrate decomposed. [1A, 1T] b. Calculate the mass, in g, of NO2 gas that would be evolved. [2A] c. If someone were to measure the mass of the gas evolved from the chemical reaction would they find it were more, or less, than the answer from part b.? Explain. [20]||