Key Question #1 - would travel faster than the heavy...

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Lesson 1 Key Questions 1) a) i) 3.17 iv) 1.35 ii) 2.47 x 10 -3 v) 7.00 iii) 102 b) The $2000 electric balance is more precise because it shows 3 digits after the decimal point instead of 2. A balance that would show only 1 or 2 digits after the decimal point would suffice because it would parallel the same precisions of the other values in the experiment (8.6 o o C). 2) a) The chlorine is much heavier (35.5) compared to 1 that the hydrogen weighs. Chlorine is 35.5 times heavier than hydrogen. b) The temperature of each gas would be the same since both gases are in the same cylinder. c) The average kinetic energy relates to the temperature. This means it is the same for both gases. d) Since the hydrogen is a smaller and lighter molecule it
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Unformatted text preview: would travel faster than the heavy chlorine molecule. 3) a) Ca=40.1g/mol (52.5g) \ (40.1 g/mol) = 1.259 mol (1.259 mol) x (6.02 x 10 23 mol) = 7.579 x 10 23 atoms of Ca There are 7.9 x 10 23 atoms of Ca in 52.5g of Ca metal b) 1.5mol x 6.02 x 10 23 = 9.03 x 10 23 There are 9.03 x 10 23 atoms of C in 1.5 mol c) 1.5mol x 6.02 x 10 23 = 9.03 x 10 23 There are 9.03 x 10 23 atoms of CO 2 in 1.5 mol 4) a) [ (P 1 V 1 ) / T 1 ] = [ (P 2 V 2 ) / T 2 ] V 1 = ? P 1 = 0.75 atm. T 1 = 243 K V 2 = 255 L P 2 = 1.25 atm. T 2 = 313 K V= [ (255L x 1.25atm.) / 313K ] x 243K / 0.75atm = 329.952 L The volume of gas would be 329.952 L at -30 o C and 0.75 atm....
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Key Question #1 - would travel faster than the heavy...

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