How do gases from the air break down rocks

How many molecules of sucrose c12h22o11 are there in 454 grams of sucrose

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Hydrogen-2 is also known as deuterium as well as hydrogen-3 is known as tritium hydrogen-1 is our common hydrogen isotope a sample hydrogen gas has 99% hydrogen -1 ,0.8% deuterium , and 0.2% tritium what is the average atomic mass of this mixture of isotope to the thousands place