How many molecules are there in 45.0 grams of CH4?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2