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Galina-37 [17]
3 years ago
14

Which object gives off heat?

Chemistry
2 answers:
nadezda [96]3 years ago
7 0

Answer:

Flashlight

Explanation:

A flashlight gives out heat

hope this helps...

statuscvo [17]3 years ago
5 0
Answer:
B) flashlight

Because that’s the only one that makes sense to me
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What is the mass of KOH found in a 785 mL of a 1.43 M solution of KOH
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Molarity is defined as the ratio of number of moles to the volume of solution in litres.

The mathematical expression is given as:

Molarity = \frac{Number of moles}{volume of solution in litres}

Here, molarity is equal to 1.43 M and volume is equal to 785 mL.

Convert mL into L

As, 1 mL = 0.001 L

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Rearrange the formula of molarity in terms of number of moles:

Number of moles =molarity\times volume of solution in litres

n = 1.43 M \times 0.785 L

= 1.12255 mole

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1.12255 mole  = \frac{mass in g}{56.10 g/mol}

mass in g = 1.12255 mole\times 56.10 g/mol

= 62.97 g

Hence, mass of KOH = 62.97 g



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