An oxygen gas container has a volume of 20.0 l. how many grams of oxygen are in the container if the gas has a pressure of 883 mmhg at 24 ∘c? express your answer to three significant figures and include the appropriate units.

Answer : The mass of oxygen gas will be, 30.5 grams

Solution :

Using ideal gas equation,

where,

n = number of moles of gas

w = mass of gas  = ?

P = pressure of the gas =

conversion used : (1 atm = 760 mmHg)

T = temperature of the gas =

M = molar mass of oxygen gas = 32 g/mole

R = gas constant = 0.0821 Latm/moleK

V = volume of gas = 20.0 L

Now put all the given values in the above equation, we get the mass of oxygen gas.

Therefore, the mass of oxygen gas will be, 30.5 grams

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.