Answer:
m = 998 g
Explanation:
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In this case, according to the definition of the molar mass as the mass of one mole of the compound, it is possible to state the 1 mole of C8H18 has a mass of 114.26 grams; therefore, the mass in 8.65 moles turn out to be:

In agreement to the notation requirement.
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Answer:
A scale, or a weight. Both of which are more scientifically referred to as a balance.
Is bubble chamber one of your choices? Bubble chamber sounds like a good fit for the question.
The potential energy of the products is higher than the potential energy of the reactants.