Answer:
a. 8.37 g,
b. 11.67 g
Explanation:
A) Given:
We need to find the mass of argon.
Firstly, we need to apply the ideal gas law in order to find the total number of moles of gases present in the flask:
From here:
Substituting the variables:
Find the number of moles of hydrogen dividing its mass by the molar mass:
Now find the moles of argon:
Using the molar mass of argon, convert this number into mass:
B) Given:
Firstly, the total pressure is equal to the sum of the vapor pressure of water and the partial pressure of oxygen. Knowing this, solve for the pressure of oxygen:
Use the ideal gas law:
Rearrange the equation, so that we have moles in terms of the mass and the molar mass of oxygen:
Convert the pressure of oxygen into atm knowing that 1 atm = 760 mm Hg. Then:
Now rearrange the ideal gas law equation for mass:
Solve using the variables identified:
The structure for this question is attached. I think the correct answer would be the fourth option. The common name of the structure would be ethyl isobutyl ketone. Other name would be 2-methyl-3-pentanone. It has a chemical formula of C7H14O or (CH3)2CHCH2C(O)CH2CH3. It is classified as an aliphatic ketone and is used as a solvent and a reagent in laboratory experiments. It is a VOC or volatile organic compound. This compound can also be found at times in normal human biofluids and in feces for about 25% of the population. At normal conditions, it exists as a solid compound.
I got B. Because the answer is K2SO4, I got it right on my test so I know its right