How many kilojoules of heat are absorbed when 10.0g of water is heated from 18°C to 85°C? The specific heat of water is 4.184 J/g °C. (Hint: you will need to calculate heat in Joules and then convert your answer to kilojoules)

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

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?