A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe.

  • Thomas Edward Thorpe
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe. Source: Wellcome Collection.

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    41. Tlie coefficient of expansion for o‘oo3665. What is the coefficient for 1° R. ? for i' gases (a) 1° F., and C. is 42. A certain volume of air preserved at a constant temperature measures 150 cubic centimetres when the barometer stands at 760 millimetres. On the following day its volume is found to have decreased i'52 cubic centimetres. Calculate the .alteration in the height of the barometer which must have ensued. 43. A balloon containing 1200 cubic metres of coal gas under a pressure of 770 millimetres of mercury ascends until the barometer stands at 530 millimetres. What volume would the gas in the balloon now occupy suppos- ing none to have escaped ? 44. A certain quantity of nitrogen measuies 155 cubic centimetres at to C., and under a pressure of 530 milli- metres of mercury. What will the volume become at iiS’7 C., and under a pressure of 590 millimetres of mer- cury. 45. Calculate the temperature at which air possesses a density equal to that of hydrogen at 0° C. 46. Oxygen is j)assed into an eudiometer till the upper level of the mercury stands at 250 mm., level in trough at 780 mm. It is rec|uired to add double the quantity of liydrogen ; if the tube be adjusted till the trough level becomes .again 780 mm. and the average volume of 10 mm. of tube is 174 C.C., what will be the reduced volume of the added hydrogen, and what the reading of the upper level of the mercury in the eudiometer after the addition (Bar. 754 mm., T. 17-5' C.)? 47. .Supposing the atmosphere to be saturated at I5°C., barometer 754 mm., what is the ]jer centage volume of aqueous vapour contained in the air? 48. Defining the dew-point as the temper.ature at which the air would be saturated when containing the amount of vapour of water present at the time of observation, give the per centage volume of aqueous vapour present in the air when the dew-point is is'* C. and 5° C. respectively