Question

$\huge\underline\bold{Question:}$

Calculate the no. of moles in
a) 100g Iron Fe-56
b) 100g of water

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Answer 1

Answer:

No. of moles = Mass / Molecular mass

a) No. of moles = 100/56 = 1.79

b) No. of moles = 100/18 = 5.56

Answer 2

Answer:

Divide the mass of the substance in grams by its molecular weight. This will give you the number of moles of that substance that are in the specified mass. For 12 g of water, (25 g)/(18.015 g/mol) = 0.666 moles.

1)

• 56 g of iron contains 6.023*10^23 no. of moles. or,100g of iron contain 1.07^24 no
• 1.79 moles
• 1.79 moles are there in 100g of iron

2)

• Number of moles=100g/ 18.02 g/ moles= 5.55 moles.
• 5.55 moles
• There are approximately 5.55 moles of water in a 100-gram sample of water.
• Number of moles= mass in g/ molecular mass in g/moles
• Mass: 100g
• Molecular mass of water, H2O: 18.02 g/ moles
• Number of moles=100g/ 18.02 g/ moles= 5.55 moles.

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