Question

1. Calculate the number of moles for the
following:
(i) 52 g of He (finding mole from
mass)
(ii) 12.044 x 1023 number of He atoms
(finding mole from number of
particles).​

Answer 1

Step-by-step explanation:

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Answer 2

DETAILED ANSWER

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i) 52g of He

$n = \frac{given \: mass}{molar \: mass}$

Here,

n= number of moles

$n = \frac{52}{2}$

Because, Molar mass of helium is 4g

$n \: = 13$

Number of moles = 13

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ii)

$12.044 \times {10}^{23}$

Of He atom.

$n = \frac{number \: of \: atoms}{avogdro \: constant}$

$n = \frac{12.044 \times {10}^{23} }{6.022 \times {10}^{23} }$

The value of Avogadro's constant =

$6.022 \times {10}^{23}$

$n = 2$

Number of moles=2

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