2. Atoms & Elements

The heat of combustion of hydrogen gas is –286 kJ/mol. What is this value expressed in kJ/g?

What is the molar mass of MgSO_4?

How many grams are present in 3.7 moles of Na2O?

What is the total number of atoms present in one formula unit of the compound Ca(ClO_3)_2?

What is the mass in grams of 42.30 moles of LiCl?

What is the molar mass of neon (Ne)? Round your answer to two decimal places. (g/mol)

If seawater contains 3.2 × 10^{-9} g of gold per liter, how many grams of gold are present in 1.00 L of seawater?

What is the molar mass of Ca(OH)_2?

What is the percent by mass of Mg in MgO?

The molar mass of nitrogen (N_2) is 28.02 g/mol. What is the mass of 2.50 moles of N_2?

What is the molar mass of magnesium (Mg) atoms?

What is the molar mass of carbon (C)?

How many grams are present in 0.90 mol of Pd (palladium)? (Atomic mass of Pd = 106.42 g/mol)

Which statement is true about the molar mass of chlorine gas (Cl_2)?

In the chemical formula Ca(OH)_2, how many atoms of each element are present in one formula unit?