1Hydrogen becomes a liquid at 2027K What is this temperature

1.Hydrogen becomes a liquid at 20.27K. What is this temperature in (a) °C? (b) °F?

2.Camels have been reported to drink as much as 22.5 gal of water in 12 hr. How many liters can they drink in 30. days?

3.In the United States, land is measured in acres. There are 43,560 ft2 in each acre. How many km2 are in 125 acres?

4.A 25.0-mL sample of water at 90°C has a mass of 24.12 g. Calculate the density of water at this temperature.

5.Which liquid will occupy the greater volume, 50 g of water or 50 g of ethyl alcohol? Explain.

6.The density of sulfuric acid is 1.84 gmL. What volume of this acid will weigh 100. g?

7.Dark-roasted coffee contains increased amonts of N methylpyridinium, or NMP, a ringed compound that is not pres ent in green unroasted coffee beans. This compound seems to decrease the stomach acid production normally associated with drinking coffee. In coffee made from dark-roasted coffee, the con centration of NMP is 31.4 mg/L. How many milligrams of NMP would you consume if you drank 2.00 large cups of dark-roasted coffee? (One coffee cup contains 10.0 fluid ounces of liquid.)

8.A 35.0-mL sample of ethyl alcohol (density 0.789 g/mL) is added to a graduated cylinder that has a mass of 49.28 g. What will be the mass of the cylinder plus the alcohol?

Solution

1) T in K =T in  ^oC + 273

or,T in ^oC = K - 273 = 20.27- 273 = -252.73 ^oC

T in K = 5/9 (T in ° F - 32) + 273

or, T in ° F = 9 /5 (T in K - 273) + 32 = = 9 / 5 (  20.27 - 273) + 32 = - 422.9 ° F