How many quarts is 500. milliliters? (3 min.) 1L = 1.057 qt    

An unknown compound contains 58.37 mass percent bromine and 41.63 mass percent fluorine. Determine its empirical formula. Atomic Mass Bromine (Br) = 79.904 g/mol Atomic Mass Fluorine (F) = 18.998 g/mol    

Some atoms, like hydrogen and nitrogen, exist naturally as diatomic molecules.

6 min. What is the theoretical yield, in grams, of Cl2 when 16.0 g of MnO2 and 30.0 g of HCl react according to the following chemical equation?             MnO2 + 4HCl 

Iron has a density of 7.87 g/mL.  What mass of iron has a volume of 5.97 mL? (3 min.)  

Calculate the heat absorbed when 28.6 g of water is heated from 22.0°C to 78.3°C (specific heat of water = 4.184 J/(g·K)). 1 J = 1000 kJ. 4 min. HINT:  Notice the units on the answers provided.          

Iron has a density of 7.87 g/mL.  What mass of iron has a volume of 5.97 mL? (3 min.)  

Consider a gas sample with a volume of 1.50 L at a constant temperature.  If the pressure is changed from 2.30 atm to 3.60 atm, what will the final volume be? 4 min.  

A gas occupies a volume of 3.16 L.  It weighs 9.33 grams at 32.0°C and 1.00 atm. What is the molar mass of the gas? 5 min.  R = 0.0821 L atm/mol K

    Consider the following formula/name combinations.  Which letter shows the one that is incorrect?  A)  SF6  sulfur hexafluoride B)  NO2  nitrogen dioxide C)  PF5  phosphorus pentafluoride D)  BN  boron nitride E)  ICl7 iodine heptachloride