3 years ago

A prostar has a high enough ________ to become a star

2 answers:

6 0

The answer to your question is B) mass
A prostar has a high enough MASS to become a star.
Hope this helps, love to help:).

BigorU [14]3 years ago

5 0

The correct answer is A. Mass. Hope I helped! :)

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Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene is burned in a bomb calorim

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Answer:

$\Delta E_{rxn}$ for combustion of naphthalene is -5164 kJ/mol

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$\Delta E_{rxn}=C_{calorimeter}\times \Delta T_{calorimeter}$

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Here, $\Delta T_{calorimeter}=(32.33-24.25)^{0}\textrm{C}=8.08^{0}\textrm{C}$

So, $\Delta E_{rxn}=(5.11\frac{kJ}{^{0}\textrm{C}})\times (8.08^{0}\textrm{C})=41.3kJ$

$\Delta E_{rxn}$ is generally expressed in terms of per mole unit of reactant. Also, $\Delta E_{rxn}$ should be negative as it is an exothermic reaction (temperature increases).

Molar mass of naphthalene is 128.17 g/mol

So, 1.025 g of naphthalene = $\frac{1.025}{128.17}moles$ of naphthalene

= 0.007997 moles of naphthalene

$\Delta E_{rxn}=-\frac{41.3kJ}{0.007997mol}=-5164kJ/mol$

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How does a change in thermal energy affect the liquid in a thermometer?

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