How many joules of heat are needed to raise the temperature of 1.0-kg of aluminum from 22℃ to 55℃, if the specific heat of aluminum is 900 J/kg℃?

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?