I just want to check my work,

How much heat is created by 79.2 g O2?

What is the mass of 4 molecules of co2

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)

What is the value of the standard enthalpy of formation of an element in its most stable form?