Could anyone help me with parts B, C, and E it would be greatly appreciated?

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Answer 1 · 2018-06-06T06:25:59

$"B."$

$20%$ of air consist of oxygen.

So, mass of air that contains $"2.5 kg"$ oxygen is

$"m" = "2.5 kg"/(20%) = "2.5 kg"/20 × 100 = "12.5 kg"$

—————

$"C."$

$"V"_"air" = "Mass"_"air"/"Density"_"air"$

$color(white)("V"_"air") = "12.5 kg"/"1.29 kg/m"^3$

$color(white)("V"_"air") = "9.69 m"^3$

—————

$"E."$

"Use Volume of oxygen from part B"
There is no mention of volume of oxygen in part B

If $"12.5 kg"$ air whose volume is $"9.69 m"^3$ (calculated in part C) is stored in cylinderical tank then height ( $h$ ) of the cylinder is

Volume of cylinder $=$ Volume of air $= pir^2h$

$h = "V"_"air"/(πr^2)$

$color(white)(h) = "9.69 m"^3/(3.14 × ("1.85 m")^2)$

$color(white)(h) = "0.902 m"$