2. Atoms & Elements

How many moles of carbon are present in 4.1 × 10^{24} atoms of carbon?

How many moles of CaCl_2 are present in 250 mL of a 3.0 M CaCl_2 solution?

A solution is prepared by dissolving potassium fluoride (KF) in 347 g of water to make a 0.175 molal (m) KF solution. How many moles of KF are present in the solution?

How many chlorine atoms are present in 29 molecules of chloroform (CHCl_3)?

How many moles of beryllium atoms are present in 36 g of Be? (Atomic mass of Be = 9 g/mol)

How many atoms are present in one mole of a substance?

How many molecules are present in 2.30 grams of NH_3?

How many atoms are present in 3.50 moles of calcium (Ca)?

How many moles are present in 23.4 g of CaCl_2?

How many moles of HNO3 are required to prepare 5.0 liters of a 2.0 M solution of HNO3?

How many moles of copper (Cu) are present in 65.8 g of Cu? (Atomic mass of Cu = 63.5 g/mol)

Which sample contains a total of 6.0 × 10^{23} atoms?

How many molecules are present in 4.25 mol of CCl_4?

How many particles are present in one mole of a substance?

If you have 267 grams of aluminum chloride (AlCl_3), how many moles of AlCl_3 do you have?