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alex41 [277]
3 years ago
9

What happened to the amplitude from wave A to wave B?

Chemistry
2 answers:
lubasha [3.4K]3 years ago
8 0
The amplitude doubled
dangina [55]3 years ago
4 0
The amplitude doubled
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How much ch2o is needed to prepare 445 ml of a 2.65 m solution of ch2o?
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Answer: 35.4 grams

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

where,

Molality = 2.65

n= moles of solute =?

 V_s = volume of solution in ml = 445 ml

Putting in the values we get:

2.65=\frac{n\times 1000}{445ml}

n=1.18

Mass of solute in g=moles\times {\text {molar mass}}=1.18mol\times 30.02g/mol=35.4g

Thus 35.4 grams of CH_2O is needed to prepare 445 ml of a 2.65 m solution of CH_2O.

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