Monday, December 7, 2009

December 4, 2009 (molecular formulas)

Finding Molecular Formulas
It is easy to do if you know the empirical formula and the Molar Mass.

If the empirical formula for a compound is CH2O and the molar mass is 90.0g/mol. Find the molecular formula.
Stock Solutions
  • Are concentrated solutions from suppliers
12 M HCl
15 M HNO3
18M H2SO4

Makiki wants to make 200mL of 0.40M HCl. What volume of 10.0M HCl should she use?
V1= ? V2= 0.200L C2V2 = C1V1
C1= 10.0M C2= 0.40M (0.40M)(0.200L) = (10.0M) V1
V1 = 0.008L/ 8mL

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