How many grams of water are produced from the decomposition of 63 grams of lithium hydroxide (LiOH)? 2 LiOH → H2O + Li2O

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it