What is the density of any object with a mass of 120g and volume of 7ml ?

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Can someone me with 6 to 10 plz this is for masteries test.

How many moles of kci are produced from 2.50 moles k