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kozerog [31]
3 years ago
10

Which would be a biotic factor in an ecosystem? 1)air 2)rain 3)algae

Chemistry
2 answers:
laila [671]3 years ago
7 0
Air and rain are very important
Mars2501 [29]3 years ago
5 0

Answer:

3

Explanation:

because biotic are things you can touch

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3) Calculate the percent by mass of 3.55 g NaCl dissolved in 88 g water.
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Answer:

The percent by mass of 3.55 g NaCl dissolved in 88 g water is 3.88%

Explanation:

When a solute dissolves in a solvent, the mass of the resulting solution is a sum of the mass of the solute and the solvent.

A percentage is a way of expressing a quantity as a fraction of 100. In this case, the percentage by mass of a solution is the number of grams of solute per 100 grams of solution and can be represented mathematically as:

Percent by mass=\frac{mass of solute}{mass of solution} *100

In this way it allows to precisely establish the concentration of solutions and express them in terms of percentages.

In this case:

  • mass of solute: 3.55 g
  • mass of solution: 3.55 g + 88 g= 91.55 g

Replacing:

Percentbymass=\frac{3.55}{91.55}*100

Percent by mass= 3.88%

<u><em>The percent by mass of 3.55 g NaCl dissolved in 88 g water is 3.88%</em></u>

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