What is the pressure in a 29.0-L cylinder filled with 45.5 g of oxygen gas at a temperature of 325 K ?

P = 1.29 atm

Explanation:

Given data:

Volume of cylinder= 29.0 L

Mass of oxygen gas = 45.5 g

Temperature = 325 K

Pressure of gas = ?

Solution:

First of all we will calculate the number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 45.5 g/ 32 g/mol

Number of moles = 1.4 mol

Pressure of oxygen:

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

P ×29.0 L = 1.4 mol × 0.0821 atm.L/ mol.K   × 325 K

P = 37.36 atm. L / 29.0 L

P = 1.29 atm

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.