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Zanzabum
3 years ago
7

How many moles and atoms are there in 60 grams of Calcium? quick answer plz i m preparing for exams

Chemistry
1 answer:
Nesterboy [21]3 years ago
4 0

Answer:

the number of mol that 60 gram of calcium will have this 1.5 mol.

as number of mole is equal to

n=w/m which is

60/40 which is 1.5 mol

and that of the number of atoms it will have will be 60 over 40 times the algorithm constant 6.223 times 10 to the power 23 which will give 9.0 345 ×10²³

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3 years ago
9. Using the balanced equation from Question #8, how many grams of lead will be produced if 2.54 grams of PbS is burned with 1.8
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Answer: 2.24 grams of Pb

Explanation:

<u>Step 1</u>

Balanced chemical reaction;

2PbS + 3O2 → 2Pb + 2SO3

<u>Step 2</u>

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<u>Step 3</u>

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If we assume that PbS is the limiting reactant;

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We have 0.0108 moles of PbS. That needs ( 0.0108 * 3) / 2 = 0.0162 moles of O2. But we have 0.0588 moles of O2 which is in excess further confirming that PbS is the limiting reactant since it will be depleted in the reaction.

<u>Step 4</u>

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Moles of Pb = (0.0108 moles  * 1 ) 1

Moles of Pb =0.0108 moles

<u>Step 5</u>

Mass of Pb

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Mass of Pb =0.0108 moles * 207.2 g/mol

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