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   

Use the calculator on the HonorLock toolbar (bottom of the screen) to do the following problem and select the correct answer below. Make sure your calculated answer (to 3 sig figs) matches the response below. How many grams does 7.10 x 1024 atoms of carbon weigh?  7.10 ×1024 atoms C ×1 mol C6.022 ×1023atoms C×12.011 g C 1 mole C={“version”:”1.1″,”math”:”7.10 ×1024 atoms C ×1 mol C6.022 ×1023atoms C×12.011 g C 1 mole C=”}

Which scientist made his discovery using J-tubes?