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determine the molecular formulas?
Determine the molecular formulas to which the following empirical formulas and molar masses pertain. (Type your answer using the format CO2 for CO2.)
(a) SNH (188.35 g/mol)
(b) NPCl2 (347.64 g/mol)
(c) CoC4O4 (341.94 g/mol)
(d) SN (184.32 g/mol)
please show work
1 Answer
- Flying DragonLv 71 decade agoFavorite Answer
These are very simple; remember, the empirical formula is the actual formula reduced to the smallest whole numbers still having the same ratio. For example, the empirical formula for C6H6 is CH. You are essentially finding out how many empirical formulas fit into the given molecular weight:
First, find the weight of the empirical formula:
SNH= 32.06 + 14.01 + 1.01 = 47.08
Then, divide the given molecular weight by the empirical formula weight:
188.35/47.08 = 4.00063... = 4
You should get a whole number (or very close), the actual formula is the empirical one multiplied by the number you just found:
SNH x 4 = S4N4H4
All the others are done the same way.
