Calculate the actual mass of 0.25 gram atom of calcium.

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Solution

Step 1: mass of 0.25 gram atom of calcium.
Step 2:
No. of gram atoms $= \frac{given mass}{atomic mass}$
Step 3:
$0.25 = \frac{\times}{40}$
$\times = 40 \times 0.25$
$= 10 gm$
Mass of 0.25 g atom of calcium = 10 gm.

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