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hoa [83]
3 years ago
11

You have 100 grams of potassium fluoride (KF) .

Chemistry
1 answer:
laiz [17]3 years ago
6 0

Answer:

Option C = 1.72 mol

Explanation:

Given data:

Mass of KF = 100 g

Moles of KF = ?

Solution:

First of all we have to calculate the molar mass of KF.

Molar mass of KF = 39.0983 g/mol + 18.998403 g/mol

Molar mass of KF = 58. 0967 g/mol

Formula:

Number of moles = mass/molar mass

Number of moles = 100 g/ 58.0967 g/mol

Number of moles = 1.72 mol

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Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq)HCl(aq), as descr
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Answer: 0.887 g of MnO_2 should be added to excess HCl(aq).

Explanation:

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PV=nRT

P = pressure of gas = 805 torr = 1.06 atm  (760torr=1atm)

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Mass of MnO_2 =moles\times {\text {Molar mass}}=0.0102mol\times 87g/mol=0.887g

0.887 g of MnO_2 should be added to excess HCl(aq).

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