MOLES_REVIEW_L1

# Find the empirical formula of a compound that is

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• apiccirello
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9.   Find the empirical formula of a compound that is composed of 65.2 % scandium and 34.8 %        oxygen.   (Sc 2 O 3 ) 10. What is the molecular formula of a compound with a molecular weight of 88 g and a        composition of 54.5 % carbon, 13.6 % hydrogen, and 31.8 % nitrogen?          (C 4 H 12 N 2 ) 11. How many molecules are in 5.23 g of C 6 H12O 6 ? ( 1.75 x 10 22  mcs ) 12.  Ascorbic acid (vitamin C) contains 40.92% carbon, 4.57% hydrogen and 54.50% oxygen.        What is its empirical formula? (C 3 H 4 O 3 )

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13. How many oxygen atoms are present in 4.20 g of sodium hydrogen carbonate?(9.03 x 10 22 at.) 14. Calculate the number of grams of nitrogen in 0.452 kg of calcium nitrate. (77.2 g) 15. Automobile antifreeze, ethylene glycol, is composed of 38.7 % carbon, 9.70 % hydrogen, and      51.6 % oxygen.  It has a molecular mass of 62 g.  What is its molecular formula?       (C 2 H 6 O 2 ) 16. How many grams of sulfurous acid are in 500 ml of a 0.7 M solution?   (28.7 g) 17. What is the empirical formula for a gaseous compound that is formed from the complete
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