What does conserving mass mean in a chemical equation?

a. there is an unequal number of each type of atom on both sides of the equation.
b. there are more of each type of atom on the reactant side than on the product side.
c. there is equal number of each type of atom on the reactant side and product side.
d. there are more of each type of atom on the product side than on the reactant side.

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k