Determine the empirical formula for a substance that has 82.4% N and 17.6% H.

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

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

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %