Chemistry Help!! Can somebody please help me!!The label on a box of baking soda (sodiym hydrogen carbonate, NaHCO3) claims that there are 137mg of soium per 0.500g of baking soda. Comment on...

Chemistry Help!! Can somebody please help me!!

The label on a box of baking soda (sodiym hydrogen carbonate, NaHCO3) claims that there are 137mg of soium per 0.500g of baking soda. Comment on validity of this claim.

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What you need to figure out is:

the number of grams in a mole of NaHCO3

how many moles of NaHCO3 are in .500 grams

how many grams of Na are in that fraction of a mole

The number of grams in a mole of sodium bicarbonate is 23.00(Na) + 1.00 (H) + 12.00 (C) + 3 x16.00 (O) = 84.00 g

The number of moles in .5 grams is .5/84.00 = .0059 moles

Each mole of NaHCO3 contains 1 mole of Na, so .500 g have .0059 moles of sodium.  That means .0059 x 23.00 = .1357 grams or 135.7 mg.  This is close enough to quoted number to be the same within rounding.

 

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