4) a. Use the periodic table to calculate the molar mass of ammonia, NH,. b. A cleaning bottle contains 83.1 g of ammonia. How many molecules of ammonia are in the bottle?

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Chapter1: Chemical Foundations
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daw loac pu
nal analysis to solve each problem. Show all your work.
1) How many days is 1,430 minutes?
0.993 days
1430/60x24=143/144
2) A track star ran 1500 meters. How many feet did they run?
Conversion factors: 1 in. = exactly 2.54 cm; 100 cm = exactly 1 m; 1 km = exactly 1000 m
1 in=2.54 cm
100 cm=1 m
1 in=0,0254 m
so,1500 in =1500*0254=38.1 m
3) The molar mass of a new prescription drug is 287.34 g/mol. If the manufacturer produces 537 moles of
the drug, how many grams did they produce?
287.34 x 537 = 154301.58
4) a. Use the periodic table to calculate the molar mass of ammonia, NH,.
b. A cleaning bottle contains 83.1 g of ammonia. How many molecules of ammonia are in the bottle?
5) A molecule of oxygen (0,) has a speed of 473 m/s at a certain temperature. Determine the speed of the
molecule in kilometers per hour (km/h).
Transcribed Image Text:daw loac pu nal analysis to solve each problem. Show all your work. 1) How many days is 1,430 minutes? 0.993 days 1430/60x24=143/144 2) A track star ran 1500 meters. How many feet did they run? Conversion factors: 1 in. = exactly 2.54 cm; 100 cm = exactly 1 m; 1 km = exactly 1000 m 1 in=2.54 cm 100 cm=1 m 1 in=0,0254 m so,1500 in =1500*0254=38.1 m 3) The molar mass of a new prescription drug is 287.34 g/mol. If the manufacturer produces 537 moles of the drug, how many grams did they produce? 287.34 x 537 = 154301.58 4) a. Use the periodic table to calculate the molar mass of ammonia, NH,. b. A cleaning bottle contains 83.1 g of ammonia. How many molecules of ammonia are in the bottle? 5) A molecule of oxygen (0,) has a speed of 473 m/s at a certain temperature. Determine the speed of the molecule in kilometers per hour (km/h).
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