1. What is the empirical formula of benzene, C₆H₆?

2. What is the % Cl in CaCl₂

3. A compound contains 5.28 g of Sn and 3.37 g F. What is its empirical formula?

4.. Substance A has a % composition of 62.5% Ca and 37.5% C. It reacts with water to produce a product, B, of composition 92.3% C and 7.7% H. The molecular mass of B is 26. What are the empirical formulas of A and B; what is the molecular formula of B, and what is the balanced reaction equation of . A reacting with water.

Problem 3.47 in text

6.   Balance the following equations 

____ C6H14 + _____ O2 = ________ CO2 + _____H2O
  



________P4 + _________O2 = _______P2O5


7.Fill in the following blanks.    

a) 0.5 moles of  SO2 weighs __________ g       .       




b) 10 atoms of Cl would weigh  __________ g    




c) 10 atoms of Cl would weigh  __________ AMU




d) 0.44 g of CO2 = _______ molecules of CO2    




e) The weight percent of oxygen in Na2CO3 is __________ %    
   



f) 39 mm3 = _______ m3   



g) underline the significant figures in the number 0.0000450.




h) 0.75 g of SO2 = _____ moles




i)   0.15 L of 0.45 M NaCl = ______mol NaCl





j) What is the empirical formula of  hydrogen peroxide, H2O2?