How many atoms are contained in a mole of $C a (O H)_{2}$ ?

30 \times 6.02 \times 10^{23}

atoms

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5 \times 6.02 \times 10^{23}

atoms

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6 \times 6.02 \times 10^{23}

atoms

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None of these

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Solution

The correct option is A $5 \times 6.02 \times 10^{23}$ atoms
Calcium Hydroxide has three atoms 5 atoms in each molecule.
One calcium atom
Two oxygen atoms
Two hydrogen atoms
So total $5 N_{A}$ atoms are present in $N_{A}$ molecules.

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Molar mass of F₂is 38 g. How many atoms are present in 0.147 mole of F₂?

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(N_{A} = 6.02 \times 10^{23})

Four grams of caustic soda contains :

(a) $6.02 \times 10^{23} a t o m s o f i t,$
(b) 4 g atom of sodium,
(c) $6.02 \times 10^{22}$ molecules

(d) 4 moles of NaOH.

The number of atoms present in 4.25 g of $({NH}_{3})$ is approximately.

a) $1 \times 10^{23}$

b) $1.5 \times 10^{23}$

c) $0.25 \times 10^{23}$

d) $6.02 \times 10^{23}$

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