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1) The magnesium weighing 355g in a sample of water is first converted to MgNH4PO4 and then to Mg2P2O7. The mass of Mg2P2O7 obtained is 0.0870g. Express the quantity of magnesium in the mineral water in parts per million (that is, in g Mg per 10^6 g H2O).
a) 119ppm b) 53.5 ppm c)1.9 x 104 ppm d) 0.119ppm e) 26.8 ppm
2) A 10.0g sample of bismuth tribromide, BiBr3, contains:a) 5.360 x 10^22 total number of ions b) 1.34 x 10^22 bromide ionsc) 0.322 mol BiBr3 d) 4.020 x 10^22 total number of ions e) 3.14 x 10^22 formula units BiBr3
3) A 2.0 gal flask weighs 4.0 lbs when empty. When its is filled with liquid, the flask weighs 4536.0 g. What is the density of the liquid in g/mL? (1 gal=3.785 L, 1 lb=453.6)
a) 0.72 g/mL b) 0.60 g/mL c) 0.36 g/mL d) 0.14 g/mL e) 0.071 g/mL
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a gas has a volume of 4.00l at 0 degree c. what final temperature in degrees celsius is needed to cause the volume of
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A sample obtained from that mixture containing 443900 particles weighs 10.0g. Determine the number and percent relative standard deviation of NaCN particels from a sample of the mixture weighing 7.16g.
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