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cricket20 [7]
3 years ago
15

How many total moles of ions are released when the following sample dissolves completely in water? Enter your answer in scientif

ic notation. 4.55 × 10^15 formula units of Sr(HCO3)2 = _____________ mol
Chemistry
1 answer:
Katena32 [7]3 years ago
5 0

<u>Answer:</u> The number of moles of strontium bicarbonate is 7.5\times 10^{-9}mol

<u>Explanation:</u>

Formula units are defined as lowest whole number ratio of ions in an ionic compound. It is calculate by multiplying the number of moles by Avogadro's number which is 6.022\times 10^{23}

We are given:

Number of formula units of Sr(HCO_3)_2=4.55\times 10^{15}

As, 6.022\times 10^{23}  number of formula units are contained in 1 mole of a substance.

So, 4.55\times 10^{15} number of formula units will be contained in = \frac{1}{6.022\times 10^{23}}\times 4.55\times 10^{15}=7.5\times 10^{-9}mol of strontium bicarbonate.

Hence, the number of moles of strontium bicarbonate is 7.5\times 10^{-9}mol

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Calculate the acid dissociation constant Ka of a 0.2 M solution of weak acid that is 0.1% ionized is ________.
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Answer: acid dissociation constant Ka= 2.00×10^-7

Explanation:

For the reaction

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Ka= Cx × Cx/C-Cx

Ka= C²X²/C(1-x)

Ka= Cx²/1-x

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2.00×10^-7

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The ancient false idea that life appeared from nowhere
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3 years ago
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How does heat differ from temperature?
mote1985 [20]

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The internal kinetic energy obtained by the molecules of an object is known as thermal energy.

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2) If I have an unknown quantity (# of moles) of gas at a pressure of 32 atm, a volume of 70 L, and a temperature of 25˚C. How m
astra-53 [7]

Answer:

91.5 mol

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Volume of gas = 70 L

Temperature = 25°C

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Moles of gas  = ?

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T = temperature in kelvin

Now we will convert the temperature.

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By putting values,

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