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2 years ago

At what temperature does a heat pump become ineffective?

Chemistry

2 answers:

KengaRu [80]2 years ago

7 0

25 degrees to around 43 degress

gtnhenbr [62]2 years ago

4 0

Answer:between 25 and 40 degrees Fahrenheit

Explanation:

Heat pumps do not operate as efficiently when temperatures drop to between 25 and 40 degrees Fahrenheit for most systems. A heat pump works best when the temperature is above 40. Once outdoor temperatures drop to 40 degrees, heat pumps start losing efficiency, and they consume more energy to do their jobs.

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A helium balloon contains 0.40 g of helium. given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it

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Answer is 0.10 mol.

Explanation;

n = m/M

Where n is number of moles (mol), m is the mass of substance (g) and M is the molar mass of the substance (g/mol).

n = ?

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M = 4.0 g/mol

From substitution,

n = 0.40 g /4.0 g/mol

n = 0.10 mol

Hence, the balloon has 0.10 mol of He.

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Additional Information:

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