0928apchemhw

# 0928apchemhw - 34. What number of Fe atoms and what amount...

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34. What number of Fe atoms and what amount (moles) of Fe atoms are in 500.0 g of iron? 500.0 g (1 mol / 55.845 g) = 8.953 mol 8.953 mol (6.023 X 10 23 atoms / 1 mol) = 5.392 X 10 24 36. A diamond contains 5.0 X 10 21 atoms of carbon. What amount (moles) of carbon and what mass (grams) of carbon are in this diamond? 5.0x10^21 atoms (1 mol / 6.023x10 23 atoms) = .0083 mol .0083 mol X (12.011 g / 1 mol) = .10 g 40. Calculate the molar mass of the following substances. a. P 4 O 6 – P 30.97376 X 4 = 123.8950 O 15.9994 X 6 = 95.9964 219.8914 g b. Ca 3 (PO 4 ) 2 – Ca 40.078 X 3 = 120.23 P 30.97376 X 2 = 61.94752 O 15.9994 X 8 = 127.995 310.17 g c. Na 2 HPO 4 – Na 22.98977 X 2= 45.97954 H 1.00794 X 1= 1.00794 P 30.97376 X 1= 30.97376 O 15.9994 X 4= 63.9976 141.9588 g 42. What amount (moles) of compound is present in 1.00 g of each of the compounds in Exercise 40? a. 1.00 g (1 mol / 219.8914 g) = .00455 mol b. 1.00 g (1 mol / 310.17 g) = .00322 mol c. 1.00 g (1 mol / 141.9588 g) = .00704 mol

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56. Complete the following table. Mass of Sample
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## This note was uploaded on 12/19/2010 for the course BIO 0081 taught by Professor Haowu during the Spring '10 term at CUNY York.

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0928apchemhw - 34. What number of Fe atoms and what amount...

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