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Some ideal gases initially have pressure P and volume V. If the gas undergoes isothermal process
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Final pressur
In a closed container, the gas expands so that the final volume becomes 3 times the initial volume
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Known :
Initial volume (V 1 ) = V
Final volume (V 2 ) = 3V
Initial t
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Chemical Kinetics Problems with solutions >Expressing rate of reaction >First-order reaction >Second-order reaction
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In a closed container, the gas expands so that the final volume becomes 3 times the initial volume
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Known :
Initial volume (V 1 ) = V
Final volume (V 2 ) = 3V
Initial t
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Problem 1 In one store in the afternoon sold twice more pears, than in the th e morning. During whole day they sold 360 kg. pears. How many kilograms of pears are sold in the morning an how many in the afternoon? Solution: Lets take that the sold in the morning pears are x kg, then in the afternoon are sold 2x kg. Th sum x + 2x = 3x kg is the whole quantity sold pears, 360 kg. So we get the following equatio 3x = 360 <=> x = 360/3 <=> x = 120 Therefore in the morning they sold 120 kg pears, and in the afternoon 2.120 = 240 kg.
Problem 2 Ivan gathered twice more chestnuts than Peter and Boris gathered 2kg. more than Peter. Together they gathered 26 kg. chestnuts. How many kilogrammes gathered each one o them? Solution: Lets take Peter’s chestnuts as x kg., then Ivan gathered 2x kg. and Boris (x +2) kg . All gath chestnuts are: x + 2x +x +2 = 4x +2 and by condition they are 26 kg. We get the equation: 4 = 26 <=> 4x = 24 <=> x = 6 Therefore Peter gathered 6 kg., Ivan 2.6 = 12kg, Boris 6 +2 = 8 kg chestnuts.
Problem 3 Kamen read 2/3 of a book and calculated that the read part is with 90 pages more than the unread. How many pages is the whole book? Solution: Lets take the whole book as x pages. The part he read is 2/3 from x , i.e. 2/3.x We will get th unread part when from the whole book we subtract the read part, i.e. x - 2/3 . x = 3/3x - 2/3x 1/3x The read part 2/3x is with 90 pages more than the unread one, which is 1/3x Therefore 2/3x – 1/3x = 90 <=> 1/3x =90 <=> x = 90.3 = 270 So the book is 270 pages.
Problem 4 Master your Scribd One tractsemester can be ploughedwith with 6 tractors for 4 days, if they 120hectares Read Free For 30this Days Signplough up to vote on title a day. Two How the tractors were moved to another tract. The rest 4 ploughed the same tract for 5 days. & The New York Times Useful Not useful many decares average a day ploughed the 4 tractors? Special offer for students: Only $4.99/month.
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Solution: If 6 tractors ploughed 120 hectares a day and finished the tract for 4 days, then the whole tra
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