2. Atoms & Elements

In which of the following situations is the mole concept most likely to be used?

How many moles are present in 3.01 × 10^{23} molecules of H_2O?

Which of the following masses represents 0.500 mol of NaCl?

How many atoms are present in 3 moles of carbon?

How many atoms are present in one mole of any element?

How many moles of KNO3 are present in 500.0 mL of a 2.0 M KNO3 solution?

How many moles of solute are present in 2000 mL of a 1 M solution?

Which of the following best defines a mole in chemistry?

How many moles of ethane (C_2H_6) are present in 30 grams of ethane?

Which value represents the number of particles in 1 mol of a substance?

How many moles of carbon atoms are present in 1 mole of carbon dioxide (CO_2)?

How many molecules of nitrogen monoxide (NO) are present in a 22.5 g sample?

Which of the following samples contains the greatest number of moles of atoms?

How many molecules are present in $0.500$ mole of $N_2{O}_5$? (Use $N_A=6.022\times {10}^{23}$ molecules/mol.)

If you have 2 moles of Li, how many atoms of lithium do you have?