Yes, this is balanced. Each part of the substance (like Mg) has the same number on both sides.
Hope this helps you:)
I could not break unless you hit it with a sledge hammer
To calculate number of moles, all you do is divide the given mass by the molecular molar mass:
<span>i.e. 125g / 18g = 6.94444g </span>
<span>Therefore, your answer is (a) 6.94 g</span>
