2. Atoms & Elements

How many moles of oxygen atoms are present in one mole of CO_2?

How many moles of solute are present in 50.0 mL of 0.20 M KNO_3 solution?

How many hydrogen atoms are present in 35.0 grams of hydrogen gas (H_2)?

How many moles of K_2SO_4 are present in 15.0 g of K_2SO_4? (Molar mass of K_2SO_4 = 174 g/mol)

How many moles of atoms are present in 8.00 g of 13C?

A solution is prepared by dissolving 3.35 mol of NaCl in enough water to make 1.00 kg of solution. What is the mole fraction of NaCl (solute) in the solution?

How many moles of chlorine atoms are present in 71.0 g of Cl\(_2\)?

In the balanced chemical equation for the complete combustion of butane (C_4H_{10}), what is the mole ratio of butane (C_4H_{10}) to carbon dioxide (CO_2)?

How many silicon atoms are present in 2 molecules of SiH_4?