What mass of each gas is present in a 1.15 −l sample of this mixture at 25.0 ∘c?

total pressure = 666/760=0.876 atm

moles gas = 0.876 x 1.10 L / 0.08206 x 298 K=0.0394

moles N2 / 0.0394 = 330/ 666

moles N2 =0.0195

mass N2 = 0.0195 x 28.0134 g/mol= 0.546 g

moles O2 / 0.0394 = 126/666

moles O2 = 0.00745

mass O2 = 0.00745 x 32 g/mol=0.239 g

moles He/ 0.0394 = 210/ 666

moles He = 0.0124

mass He = 0.0124 x 4 g/mol=0.0497 g

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.