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algol13
3 years ago
8

Convert 56.78 grams of Ca(OH)_2 to moles

Chemistry
1 answer:
ki77a [65]3 years ago
6 0

Answer: 0.77 mole

Explanation:

Atomic mass of Ca = 40g/mol

Atomic mass of O = 16g/mol

Atomic mass of H = 1

Therefore,

1 mole of Ca(OH)_2 contains

40+[16+1]2

= 40+34

=74g/mole

Hence,

1 mole of Ca(OH)_2 = 74g

Let x mole of Ca(OH)_2 = 56. 78

x = 56.78/74

x = 0.77 mole

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Ksp=2.00x10^{-8}

Explanation:

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In this case, since the pH of the given metal is 10.15, we can compute the pOH as shown below:

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[OH^-]=10^{-pOH}=10^{-3.95}=1.41x10^{-4}M

Now, since this hydroxide has the form MOH, we infer the concentration of OH- equals the concentration of M^+ at equilibrium, assuming the following ionization reaction:

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Those reaction in which oxidation as well as reduction of substances takes place simultaneously will known as redox reactions.

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