The mass isnt relevant
520 - 120 = 400
400 / 8 = 50
50ms^-2
Again great job! They all look correct except 20. is 3.7 due to sig fig of least precision, which you have a mark by!! You don't even need help!;) Here comes the next chemical engineer! :)
The answer is 8. Hope this helps.
It is an exothermic reaction
For example <span>in chemistry, a solution is a homogeneous
mixture composed of two or more substances. In such a mixture, a solute
is a substance dissolved in another substance, known as a solvent.</span>