An unstable isotope has a half life of 3 days. How many kg of a 820 kg sample will remain after 6 days?

Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3no2(g)+h2o(l)→2hno3(l)+no(g) part a suppose that 4.2 mol no2 and 0.50 mol h2o combine and react completely. which reactant is in excess? express your answer as a chemical formula. nothing

Which terms are used to identify pure substances

Ab c or d ? i’m not sure what the answer is