2. Atoms & Elements

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)?

What is the molar mass of beryllium oxide (BeO)?

What is the molar mass of C2H6O (ethanol)? Report your answer to the nearest integer.

A 5.65 g sample of a weak acid with Ka=1.3×10⁻⁴ was combined with 5.20 mL of 5.90 M NaOH and the resulting solution was diluted to 750 mL. The measured pH of the solution was 4.20. What is the molar mass of the weak acid?

How many moles of aluminum (Al) are present in a 54.0 g sample of aluminum? (Molar mass of Al = 26.98 g/mol)

If the concentration of HNO3 is 0.01 M, what is the concentration of H+ ions in the solution?

What is the molar mass of NaHCO3 (sodium bicarbonate)?

What is the mass of 0.750 moles of ammonium chloride (NH4Cl)?

What is the molar mass of AuCl_3?

How many carbon atoms are present in 2.8 g of C2H4?

Which of the following statements is true about the molar mass of chlorine gas?