1) How much energy is released if 161 g of mercury is cooled from 85°C to 0°C? CHg=0.138 J/g oC 2) How much energy, in J, is required to raise the temperature of 123.4g of aluminum metal from 3.0 oC to 31.6 oC? CAl= 0.900 J/g oC

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Why is nh3 classified as a polar molecule

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.