B. How many moles are there in 458 g of Na2SO4? c. How many grams are there in 7.40 moles of AgNO3?

d. How many grams are there in 7.50 x 1023 molecules of H2SO4?

What is the empirical formula for a compound containing 0.0134 g iron, 0.00769 g sulfur, and 0.0115 g oxygen?

A compound composed of hydrogen and oxygen is found to contain 0.59 g of hydrogen and 9.40 g of oxygen. The molar mass of this compound is 34.0 g/mol. Find the empirical formula.

3. Empirical Formula Using Percentage: follow the method described in the notes to calculate the empirical formula for the following compounds.

a. Find the empirical formula for a compound that contains 32.8% chromium and 67.2% chlorine.

b. What is the empirical formula for a compound which contains 67.1% zinc and the rest is oxygen?

c. Qualitative analysis shows that a compound contains 32.38% sodium, 22.65% sulfur, and 44.99% oxygen. Find the empirical formula of this compound.

d. Rubbing alcohol was found to contain 60.0 % carbon, 13.4 % hydrogen, and the remaining mass was due to oxygen. What is the empirical formula of rubbing alcohol?

e. Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy. One of them is a blue solid that comes apart, reversibly, in the gas phase. It contains 36.84% N. What is the empirical formula of this oxide?