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AURORKA [14]
3 years ago
13

7. What color would a solution with pH 5.5 be when mixed with phenolphthalein indicator

Chemistry
1 answer:
Neporo4naja [7]3 years ago
5 0
The indicator remains colourless in a solution with a pH between 1-7. It turns a solution with a pH higher than 8 pink. So your given solution would not change in colour.
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B) a system is a group of objects analyzed as one unit

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<h3><u>Explanation;</u></h3>
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  • A closed system is a system that exchanges only energy with its surroundings, not matter. An isolated system does not exchange energy or matter with its surroundings.
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What kind of solid is crystalline boron
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3 years ago
The density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 via a combust
bearhunter [10]

<u>The answer is </u><u>9.94 ml.</u>

<h3>What is density?</h3>
  • Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass).
  • Another way to put it is that density is the amount of mass per unit of volume. If an object is heavy and compact, it has a high density.

Given,

        The density of ethanol, C2H5OH = 0.789 g/mL

n (CO_{2} ) = \frac{m}{M}  = \frac{15G}{44 g/mol} } = 0.341 mol;

n ( C_{2} H_{2} OH) = \frac{n (CO_{2}) }{2}  = \frac{0.341}{2}  = 0.1705  mol;

m (C_{2} H_{2} OH) = 0.1705 mol * 46  g/ mol = 7.843 g

V (C_{2} H_{2} OH ) = \frac{7.843}{0.789} = 9.94 ml.

Therefore, the answer is 9.94 ml

Learn more about density of ethanol,

brainly.com/question/18597444

#SPJ4

<u>The complete question is -</u>

If the density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation?

C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l)

5 0
2 years ago
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