In one on the compounds that contains only oxygen and nitrogen, 3.50 g of nitrogen combines with 2.00 g of oxygen. In another, 0.875 g of nitrogen combines with 1.00 g of oxygen. Show that these compounds obey the law of multiple proportions.

Explanation:

The law of multiple proportions states that if two elements X and Y combine together to form more than one compound, then the several masses of X which chemically combine with a fixed mass of Y is in simple ratio.T

FIRST CASE ;

Molar mass of Nitrogen gas = 28 g/molNumber of moles of Nitrogen gas = Mass/molar mass = 3.50/28 = 0.125 molesNumber of moles of Oxygen gas = Mass/molar mass = 2.00/32 = 0.0625 molesHence the ratio of number of moles of N2 to O2 will be 0.1295 : 0.0625 or 2:1Similarly for the SECOND CASE ; Molar mass of Nitrogen gas = 28 g/molNumber of moles of Nitrogen gas = Mass/molar mass = 0.875/28 = 0.03125 molesNumber of moles of Oxygen gas = Mass/molar mass = 1/32 = 0.03125 molesHence the ratio of number of moles of N2 to O2 will be 0.03125 : 0.03125 or 1:1

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.