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enot [183]
3 years ago
14

Nitrogen,oxygen and argon are obtained from liquid air by fractional distillation.State the physical property that makes this po

ssible​
Chemistry
1 answer:
Maurinko [17]3 years ago
8 0

they have different boiling points

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A mixture of potassium bromide and potassium hydroxide has a total mass of 5.50 g. if the mixture contains 2.45 g k, what is the
algol13
Answer is: mass in grams of KOH is 1,68.
m(KBr + KOH) = 5,50 g.
m(K) = 2,45 g.
M(KBr) = 39 g/mol + 80 g/mol = 119 g/mol.
M(KOH) = 39 g/mol + 16 g/mol + 1 g/mol = 56 g/mol.
ω(K) = 2,45 g ÷ 5,50 g.
ω(K) = 0,445 = 44,5%.
n(K) = m(K) ÷ M(K).
n(K) = 2,45 g ÷ 39 g/mol.
n(K) = 0,062 mol.
m(Br + OH) = 5,50 g - 2,45 g = 3,05 g.
n(K) = n(KBr + KOH) = 0,062 mol.
M(KBr + KOH) = 5,50 g ÷ 0,062 mol = 88,7 g/mol.
Set two equations:
1) m(KBr) + m(KOH) = 5,50 g.
2) m(KBr)/M(KBr) + m(KOH)/M(KOH) = 0,062 mol.
m(KOH) = 5,50 g - M(KBr), put that in second equation.
m(KBr) = 3,82 g.
m(KOH) = 5,50 g - 3,82 g = 1,68 g.
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3 years ago
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10.2 moles of oxygen which is 163.1 grams

Explanation:

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