Question

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Answer 1

Answer:

1) 2 moles

2)0.25 moles

Explanation:

the molecular weight of MgO is 40

1)no.of moles=80/40=2 moles

2)no.of moles=10/40=0.25 moles

Answer 2

(a)

$\LARGE\underline{\underline{\sf Given:}}$

• Mass of MgO = 80g

$\LARGE\underline{\underline{\sf To\:Find:}}$

• Mole of MgO = ?

$\LARGE\underline{\underline{\sf Solution:}}$

$\large{\boxed{\sf Mole(n)=\frac{Mass}{Molecular\:Mass}}}$

$\large\implies{\sf n=\dfrac{80}{40}}$

$\large\implies{\sf n=2\:moles }$

(b)

$\LARGE\underline{\underline{\sf Given:}}$

• Mass (m) = 10g

$\LARGE\underline{\underline{\sf To\:Find:}}$

• Mole of MgO = ?

$\LARGE\underline{\underline{\sf Solution:}}$

$\large{\boxed{\sf Mole(n)=\dfrac{Mass}{Molecular\:Mass}}}$

$\large\implies{\sf \dfrac{10}{40}}$

$\large\implies{\sf 0.25\:mole}$

$\LARGE\underline{\underline{\sf Answer:}}$

(a) Number of moles of MgO is 2 moles

(b) Number of moles of MgO is 0.25moles