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lbvjy [14]
3 years ago
8

What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass of 39?

Chemistry
1 answer:
JulsSmile [24]3 years ago
3 0
20 because
mass no=electrons+neutrons
so to find neutrons
mass no-electrons=neutron
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A 25.0 mLsample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The equivalence point is reached when 37.5
matrenka [14]

Answer:

0.263M of CH₃COOH is the concentration of the solution.

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The reaction of acetic acid (CH₃COOH) with NaOH is:

CH₃COOH + NaOH → CH₃COO⁻Na⁺ + H₂O

<em>1 mole of acetic acid reacts per mole of NaOH to produce sodium acetate and water.</em>

<em />

In the equivalence point, moles of acetic acid are equal to moles of NaOH and moles of NaOH are:

0.0375L × (0.175 moles / L) = 6.56x10⁻³ moles of NaOH = moles of CH₃COOH.

As the sample of acetic acid had a volume of 25.0mL = 0.025L:

6.56x10⁻³ moles of CH₃COOH / 0.0250L =

<em>0.263M of CH₃COOH is the concentration of the solution</em>

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3 years ago
How many moles are there in 2.75L of a 2.0M solution
gtnhenbr [62]
5.5 moles
2.0=x/2.75
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