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iVinArrow [24]
2 years ago
13

Energy is needed to break bonds in chemical reactions

Chemistry
1 answer:
NeX [460]2 years ago
7 0

Answer:

This is True

Explanation:

When a chemical reaction occurs, molecular bonds are broken and other bonds are formed to make different molecules. For example, the bonds of two water molecules are broken to form hydrogen and oxygen. Energy is always required to break a bond, which is known as bond energy.

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Varvara68 [4.7K]

Answer:

Number of moles = 0.057 × 10⁻⁷  mol

Explanation:

Given data:

Mass of SiO₂ = 3.4 × 10⁻⁷ g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass of SiO₂ = 60 g/mol

by putting values,

Number of moles =  3.4 × 10⁻⁷ g / 60 g/mol

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What is the molarity of a solution in which 25.3 grams of potassium bromide is dissolved in 150. mL of solution?
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Answer:

~1.417M

Explanation:

Molarity=(number of moles of solute)/(litres of solution)

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Mass=25.3g

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moles=(mass/molar mass)

        =(25.3)/(119)

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Molarity=(0.2126)/(150/1000)

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