2. Atoms & Elements

What is the percent composition of sodium in sodium phosphate (Na_3PO_4)?

What is the mass of 0.25 mole of sodium (Na)?

Which of the following statements correctly describes molar mass?

What is the molar mass of (NH_4)_2SO_4?

Which of the following is the correct molar mass of sodium sulfate, Na2SO4?

What is the mass in grams of 36.70 moles of KBr?

Which of the following is the molar mass of water (H_2O)?

What is the molar mass of copper (Cu)?

If a sample of CO_2 contains 48 grams of oxygen, what is the mass of the CO_2 sample?

Which of the following compounds has a molar mass of 174.3 g/mol?

Which of the following is the mass in grams of 4.25 × 10^3 mol of N_2?

Which of the following is the correct molar mass of boron trifluoride (BF_3)?

In the chemical formula 2Ca(ClO2)2, how many atoms of oxygen are present?

What is the mass of 7.00 mol of hydrogen peroxide (H_2O_2)?

What is the molar mass of acetic acid (CH3COOH)?