2. Atoms & Elements

What is the total number of atoms present in one formula unit of NH_3?

How many moles of FeCl_2 are present in 85.2 g of FeCl_2?

What is the mass of 0.240 mol of glucose (C6H12O6)?

What mass (in grams) of fructose (C6H12O6) is present in 125 mL of a 0.500 mol/L fructose solution?

What is the total mass, in grams, of 6 moles of carbon atoms? (Atomic mass of carbon = 12.011 g/mol)

What is the molar mass of Al_2(CO_3)_3?

Which conversion factor should be used to convert 3 moles of magnesium (Mg) to grams?

Given 0.247 g of N_2O, how many moles of nitrogen atoms (N) are present?

How many grams are present in 5.00 mol of sodium chloride (NaCl)?

How many atoms of H are present in 31.30 grams of formaldehyde (CH2O)?

How many grams are in 11.9 moles of chromium (Cr)?

What is the mass, in grams, of 1.56 × 10^{21} atoms of magnesium (Mg)? (Atomic mass of Mg = 24.3 g/mol)

How many grams are present in 2.50 \times 10^{23} molecules of CaO?

How many grams of H_2O are present in 0.2 moles of H_2O, given that the molar mass of H_2O is 18.01 g/mol?

If you weigh out 0.205 g of salicylic acid (C7H6O3), what is the number of moles of salicylic acid present? (Molar mass of C7H6O3 = 138.12 g/mol)