Question

1. calculate the number of moles for-

(a). 52 g of He ( find mole from mass)

(b) 12.044 × 10²³ number of He atoms ( find mole from number of particals )



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Answer 1

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Q 1. Calculate the number of moles for following

(a) 52 g of He ( find mole from mass)

⟹ Number of moles = n

⟹ Given mass = m

⟹ Molar mass = M

⟹ Given number of particles = N

Atomic mass of He = 4u

molar mass of He = 4g

$number \: of \: moles = \frac{given \: mass}{molar \: mass}$

$n = \frac{52}{4}$

$n = 13$

(b). 12.044 × 10²³ number of He atoms ( find mole from number of particals )

⟹ as we know ,

1 mole = 6.022 ×10²³

$number \: of \: moles \\ \frac{12.024 \times 10²³ }{6.022 \times 10²³}$

$= 2$