2. Atoms & Elements

How many moles of NaNO3 are present in a 44.0 g sample?

In the mole concept, how many atoms are present in 0.25 mol of magnesium (Mg)? (Use Avogadro’s number $N_A=6.022\times {10}^{23}\hspace{0.17em}\frac{\text{atoms}}{\text{mol}}$.)

In the mole concept, how many atoms are present in $1$ mole of carbon (C)?

What is the total number of moles of solute present in 0.50 L of a 3.0 M HCl solution?

How many atoms are present in a 40 g sample of carbon (atomic mass = 12.01 g/mol)?

How many atoms are present in 0.075 mol of titanium (Ti)?

How many atoms of hydrogen are present in 3.02 × 10^{22} molecules of NH_3?

If you have 33.6 L of neon gas at STP, how many moles of neon do you have?

How many atoms of Mg are present in 1.00 mole of magnesium?

How many moles are present in 10.0 mg of CO (carbon monoxide)?

How many moles are present in 8.5 × 10^{24} molecules of sodium sulfate (Na_2SO_4)?

What is the numeric value of a mole for atoms or molecules?

What is the approximate combined mole fraction of N_2 and O_2 in Earth's atmosphere?

How many sulfur atoms are present in 5.325 × 10^{-23} grams of sulfur (atomic mass of S = 32.07 g/mol)?

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