Question
The mass of a proton is $1.67 \times 10^{-27} \mathrm{~kg}$. How many protons would make 1 g ?
✓
Answer
Number of protons $=\frac{\text{Total mass}}{\text{mass of each proton}}$ $=\frac{10^{-3}}{1.67\times10^{-27}}$ $=5.99\times10^{23}$
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