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Phoenix [80]
3 years ago
7

In potassium-argon dating, how does the proportion of remaining potassium in a rock or fossil change over time?

Chemistry
2 answers:
lara [203]3 years ago
8 0

Answer:

what was the answer?

Explanation:

wariber [46]3 years ago
7 0

Answer:

it decreases

Explanation:

pennfoster

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A solution is made by mixing of water and of acetic acid . Calculate the mole fraction of water in this solution. Be sure your a
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Explanation:

please find the complete question in the attached file.

Mass of CH_3C0_2 H= 77 \ g \\\\

Molar mass of CH_3C0_2 H = 60.05 \  \frac{g}{mol} \\\\

No of moles in n_{CH_3CO_2H} = 77 \ g \times  \frac{1 \ mol \ CH_3C0_2H}{60.05 \ g}  

                                          = 1.28 \ mol \ CH_3CO_2H

Mass of water (H_2O)= 42 \ g

The molar mass of water (H_2O)= 18.02 \  \frac{g}{mol}

moles of water n_{H_2O}:

= 42 \ g \times \frac{1 mol H_2O}{18.02 \ g} \\\\= 2.33 \ mol \ H_2 O

Molfraction of acetic acid:

X CH_2CO_2H = \frac{n_{CH_3CO_2H}}{n_CH_3CO_2H +n_{H_2}}\\\\

                     =\frac{1.28 \ mol}{1.28 \ mo1 + 2.33 mol}\\\\ = 0.354\\\\= 0.35

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