i'm in a chemistry test right now so i need help. How many moles of titanium atoms are there in 8.4 x 10^21 atoms of titanium?

Titania buys a bag of fertilizers at the store.it reads 30-15-10. how much phosphorous is in the fertilizer a. 30% b. 15% c. 10%

How many grams are in one mole of lead?

372 ml is the volume of aluminum, density is 2.70 g/ml what is the mass in grams