How many molecules of water are produced when 10 molecules of hydrogen react with 5 molecules of oxygen

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Which of the following describes a situation where competition between producers exists

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma