Fred found that there 7 grams of NaOH in the beaker after he boiled the water off. How many moles of NaOH did he have in the solution when he started

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

Why is carbon ideal for making different compounds?

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