<span> N-16
</span>7 protons & 9 neutrons
<span>7 + 9 = 16
</span>
<span>when the number of moles Ca = mass of Ca / molar mass of Ca.
and we can get the molar mass of Ca, it is = 40 g/mol
and we have already the mass of Ca (given) = 9.8 g
so, by substitution: the moles Ca = 9.8 g / 40 g/mol
= 0.245 moles</span>
The answer is true. According to the second law of thermodynamics, energy tends to become more spread out