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Anettt [7]
2 years ago
13

Please help its due soon

Chemistry
2 answers:
Advocard [28]2 years ago
7 0
The answer to the problem is 136.315
mash [69]2 years ago
3 0

Answer:136.315

Explanation:Zn are irradiated and the neutron induced reaction 67 Zn (n, p) 67 Cu,

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A solution of potassium cyanide, KCN, is made by dissolving 3.2 g of KCN in water. When this solution reacts with excess hydroch
Rama09 [41]

Answer:

22.7%

Explanation:

We must first put down the equation of reaction to guide our work while solving the problem.

KCN(aq) + HCl (aq)--> KCl(aq) + HCN(aq)

The questions specifically state that HCl is in excess so KCN is the limiting reactant.

Number of moles of KCN reacted= mass of KCN reacted / molar mass of KCN

Mass of KCN reacted= 3.2 g

Molar mass of KCN= 65.12 g/mol

Number of moles of KCN= 3.2/65.12 g/mol= 0.049 moles

Theoretical yield of HCN is obtained thus;

From the reaction equation;

1 mol of KCN produced 1 mole of HCN thus 0.049 moles of KCN will produce 0.049 moles of HCN.

Mass of HCN = number of moles ×molar mass

Molar mass of HCN= 27.0253 g/mol

Hence mass of HCN produced= 0.049mol × 27.0253 g/mol= 1.32g of HCN

Actual yield of HCN= 0.30g

% yield= actual yield/ theoretical yield ×100

% yield= 0.30/1.32 ×100

%yield= 22.7%

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3 years ago
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What are the laws of Newton?
Tanzania [10]

Answer:

an object that is at rest will stay at rest inless a force acts upon it.

An oject that is in motion will not change its velocity unless a force acts upon it.

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Which two equations represent double-replacement reactions?
enyata [817]

Answer: A and D, I believe

Explanation:

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What would be the best way to measure the volume of a small ?​
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You can use a graduated cylinder.
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What does solubility mean
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Answer: The ability to be dissolved

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