Answer to Question #156994 in Inorganic Chemistry for Izzy

Question

  1) 200.0 g of Ca(C2H3O2)2 was found in the chemistry laboratory.  

    Calculate 

a) . the volume at STP if Ca(C2H3O2)2 is converted to gas.     

b) .  the molarity of a solution made by dissolving 200.0 g of Ca(C2H3O2)2 in 200 mls of water

Answer 1

 Ca(C₂H₃O₂)₂ = 40 + (24 +3 +32) * 2

= 40 + 118 = 158g/mol

mole = mass/molar mass

= 200.0 g/158g/mol

= 1.26mol

1. volume = mole * molar volume

= 1.26mol * 22.4dm³/mol

= 28.22dm³

2. molarity = mole /volume

= 1,26mol/ 0.2 L

= 0.252mol/L