Calculate the number of moles in the following:
(i) 28 g of He (ii) 46 g of Na (iii) 60 g of Ca.
Given, gram atomic mass of He = 4 g, Na = 23 g and Ca = 40 g

Explanation

To calculate the number of moles in the given substances, we will use the formula:

\[ \text{Number of moles} = \frac{\text{Given weight (g)}}{\text{Gram atomic mass (g/mol)}} \]

Now, let's calculate the number of moles for each substance step by step.

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