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-BARSIC- [3]
2 years ago
8

Please help Show your workings

Chemistry
1 answer:
Trava [24]2 years ago
3 0

Answer:

jbgnbvjbvn v ncbncjbgnbhjfjhfjhfjbfihfjh

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If the vapor pressure of an aqueous solution containing 6.00 moles of a nonvolatile solute has a vapor pressure of 19.8 torr, an
Margaret [11]

Answer:

36.5 mol

Explanation:

The vapor pressure of a solution of a non volatile solute in  water is given by Raoult´s law:

P H₂O = χ H₂O x P⁰ H₂O

where  χ H₂O  is the mole fraction of water in the solution and P⁰ H₂O

In the turn the mole fraction is given by

χ H₂O = mol H₂O / total # moles = mol H₂O /ntot

Thus

P H₂O = mole H₂O / n tot  x   P⁰ H₂0

now the mol of H₂O is equal n tot - 6  mol solute

Plugging the values given in the question and  solving the resultant equation

19.8 torr = ( ntot - 6 ) x 23.7 torr / n tot

19.8 ntot  = 23.7 ntot - 142.2

ntot = 36.5 ( rounded to 3 significant figures )

5 0
3 years ago
Question 11 please HELP
Lena [83]

The answer is A or B, I would put B.

6 0
3 years ago
What information does the chemical shift of an nmr signal convey? select the correct answer?
alexdok [17]
The answer to your question is position and number of chemical shifts give information about the structure of a organic molecule. Chemical shift describes the relative positions of the resonances in an NMR spectrum. It is also the position on the δ scale (ppm - parts per million) where the peak occurs.
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3 years ago
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Which statements below are an appropriate hypothesis in response to this question? Check all that apply. If a substance changes
Nostrana [21]

Answer:

If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.

If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.

Explanation:

So in shorter words its options 2 and 3

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Which element(s) is/are not balanced in this equation?
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The answer is d because in both sides there are 1 magnesiums 1 oxygens 2 lithiums and 2 chlorines
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