How many grams of hydrogen sulfide are needed to react with 37.0g lithium nitrate? 2LiNO3 + H2S --> Li2S + 2HNO3

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

What type of matter is made of only one kind of atom