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Anna71 [15]
3 years ago
7

If Element X has 85 protons, how many electrons does it have

Chemistry
2 answers:
BartSMP [9]3 years ago
7 0
It has 85 electrons, because an element always has the same number of electrons and protons
melamori03 [73]3 years ago
5 0
If element X has 85 protons, then it has 85 electrons. 
No matter what element it is, there will ALWAYS be the same amount of protons as there are electrons. 

By the way, thanks for asking this question. I just learned this yesterday, so it gave me a way to show what I learned. 
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At 2°C, the vapor pressure of pure water is 23.76 mmHg and that of a certain seawater sample is 23.09 mmHg. Assuming that seawat
wariber [46]

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0.808  M

Explanation:

Using Raoult's Law

\frac{P_s}{Pi}= x_i

where:

P_s = vapor pressure of sea water( solution) = 23.09 mmHg

P_i = vapor pressure of pure water (solute) = 23.76 mmHg

x_i = mole fraction of water

∴

\frac{23.09}{23.76}= x_i

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x_i+x_2=1

x_2 = 1- x_i

x_2 = 1- 0.9718

x_2 = 0.0282

x_i = \frac{n_i}{n_i+n_2}  ------ equation (1)

x_2 = \frac{n_2}{n_i+n_2}  ------ equation (2)

where; (n_2) = number of moles of sea water

(n_i) = number of moles of pure water

equating above equation 1 and 2; we have :

\frac{n_2}{n_i}= \frac{0.0282}{0.9178}

= 0.02901

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= 1.616 M

As we assume that the sea water contains only NaCl, if NaCl dissociates to Na⁺ and Cl⁻; we have \frac{1.616}{2} =0.808 M

3 0
3 years ago
Read 2 more answers
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