The following question appears on a quiz: "you fill a tank with gas at 60°c to 100 kpa and seal it. you decrease the temperature to 10°c but keep the volume constant. what happens to the pressure? " a student answers that the new pressure will be 17 kpa. which of the following explanations is true?

the student did not solve for the correct parameter, and the answer should be 50 kpa.

the student did not solve for the correct parameter, and the answer should be 600 kpa.

the student did not work with absolute temperatures, and the answer should be 85 kpa.

the student did not work with absolute temperatures, and the answer should be 888 kpa.

The student did not work with absolute temperatures, and the answer should be 85 kPa.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

P₁T₂ = P₂T₁

P₁ = 100.0 kPa, T₁ = 60.0°C + 273 = 333.0 K.

P₂ = ??? kPa, T₂ = 10.0°C + 273 = 283.0 K.

∴ P₂ = P₁T₂/T₁ = (100.0 kPa)(283.0 K)/(333.0 K) = 84.98 kPa ≅ 85.0 kPa.

The student did not work with absolute temperatures, and the answer should be 85 kPa.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.