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Chemistry help! MSG food-flavor?
Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed for “Chinese restaurant syndrome,” the symptoms of which are headaches and chest pains. MSG has the following composition by mass: 35.51 percent C, 4.77 percent H, 37.85 percent O, 8.29 percent N, and 13.60 percent Na. What is its molecular formula, if its molar mass is about 169 g/mol?
Thank you!
Suppose you have 100 g of MSG. Then according to the percentages given, there are 35.51 g C, 4.77 g H, 37.85 g O, 8.29 g N, and 13.60 g Na. Convert those quantities to moles.
35.51 g C / 12.0 g/mole = 2.96 moles C
4.77 g H / 1.0 g/mole = 4.77 moles H
37.85 g O / 16.0 g/mole = 2.37 moles O
8.29 g N / 14.0 g/mole = 0.592 moles N
13.60 g Na / 23.0 g/mole = 0.591 moles Na
Divide each of these by the smallest (0.591) and we get
C – 5.01
H – 8.07
O – 4.01
N – 1.00
Na – 1.00
So the empirical formula is C5H8O4NNa. The formula weight for this is (5 x 12.0) + (8 x 1.0) + (4 x 16.0) + (1 x 14.0) + (1 x 23.0) = 169, which happens to be the molar mass. So the molecular formula and the empirical formula are the same, C5H8O4NNa.
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