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3 years ago

14

How many atoms of Cl are there in 25 moles of Cl(subscript)2 ? Can someone show the work and explain this to me I'm so lost

1 answer:

Verizon [17]3 years ago

5 0

One mole of a substance contains 6.022×10^23 atoms

25mols of Cl2 actually contains 50moles of Cl because it is a diatomic molecule
so the answer is 50 ×6.022×10^23 = 3.011×10^25 atoms of Chlorine

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Calculate the concentration of A bottle of wine contains 12.9% ethanol by volume. The density of ethanol (CH3OH) is 0.789 g/cm e

Delicious77 [7]

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The mass percentage of the solution is 10.46%.

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Volume of alcohol = v = 12.9 L

Mass of the ethanol = m

Density of the ethanol ,d= $0.789 g/cm^3=0.789 g/mL$

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$m=d\times v=0.798 g/ml\times 12.9 mL = 10.1781 g$

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$(w/w)\%=\frac{m}{m+M}\times 100$

$\frac{10.1781 g}{10.1781 g+87.1 g}\times 100=10.46\%$

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3 years ago

A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution before the addition of any HNO3.

alex41 [277]

Answer:

$pH=11.12$

Explanation:

Hello,

In this case, ammonia dissociation is:

$NH_3(aq)+H_2O(l)\rightleftharpoons NH_4^+(aq)+OH^-(aq)$

So the equilibrium expression:

$Kb=\frac{[NH_4^+][OH^-]}{[NH_3]}$

That in terms of the reaction extent and the initial concentration of ammonia is written as:

$1.8x10^{-5}=\frac{x*x}{0.10M-x}$

Thus, solving by using solver or quadratic equation we find:

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And the pH from the pOH is:

$pH=14-pOH=14-2.88\\\\pH=11.12$

Best regards.

6 0

3 years ago