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A US barrel is 4.21 cubic feet.  Express this volume in liters. (1L= 1dm3, 1m = 3.28 ft)

Each sample in the figure below contains 6.022 X 1023 molecules or formula units. Which, if any, has the most mass?    

How many moles of carbon dioxide, CO2, are there in 56.02 g of carbon dioxide? (If you wish, you can show math work for possible partial credit.)  

Aluminum metal reacts with iron(II) sulfide to form aluminum sulfide and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?

Balance the following equations, if the value is 1, enter the 1:      [1_1] C3H8O(l) + [1_2] O2(g) → [1_3] CO2(g) + [1_4] H2O(l)

  A piece of a metal alloy with a mass of 114 g was placed into a graduated cylinder that contained 25.0 mL of water, raising the water level to 42.5 mL.  What is the density of the metal?

Identify the spectator ions in the following molecular equation.            LiCl(aq) + AgNO3(aq) → AgCl(s) + LiNO3(aq)

Identify the spectator ions in the following molecular equation.    Pb(NO3)2 (aq) + 2 NaBr (aq)  →  PbBr2 (s) + 2 NaNO3(aq)

Write the complete ionic equation for the following molecular equation.  Include phases.   2  AgNO3 (aq) + Na2CO3 (aq)  →  Ag2CO3(s) + 2 NaNO3 (aq)

Balance the following equations, if the value is 1, enter the 1:     [1_1] PH3(g) + [1_2] O2(g) → [1_3] P4O10(s) + [1_4] H2O(g)