Answer = c
Conservation of mass (mass is never lost or gained in chemical reactions), during chemical reaction no particles are created or destroyed, the atoms are rearranged from the reactants to the products.
It will form a tetraamminezinc sulphate and a blue solution will be formed...the reaction should be carried out in a fume chamber because a poisonous substance will be released to the atmosphere
Answer:
Explanation:
Percent composition is percentage by the mass of element present in the compound.
The formula for chromium(III) nitrate is 
Molar mass of chromium(III) nitrate = 238.011 g/mol
1 mole of chromium(III) nitrate contains 9 moles of oxygen
Molar mass of oxygen = 16 g/mol
So, Mass= Molar mass*Moles = 16*9 g = 144 g
Molar mass O₂ = 32.0 g/mol and N₂ = 28.0 g/mol
N₂ +2 O₂ → 2 NO₂
28.0 g -------> 32.0 * 2
7 g ----------> ?
Mass of O₂ = 7 * 32.0 * 2 / 28.0
Mass of O₂ = 448 / 28.0
= 16 g of O₂
Answer B
hope this helps!