If i have 42x10 to the 23rd power of atoms of Xe how many grams do i have? show all your work

What are the genotypic and phenotypic ratios

0.09 moles of sodium sulfate in 12 ml of solution

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?