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S_A_V [24]
3 years ago
15

Maki uses 20 gallons of a solution with an unknown ethanol concentration and 60 gallons of a 12% ethanol solution to make 80 gal

lons of a 10% solution. What is the value of x, the concentration of the unknown ethanol solution?.
a. 0.02.
b. 0.04.
c. 0.05.
d. 0.08
Chemistry
2 answers:
Leokris [45]3 years ago
5 0

the correct answer is B

Marrrta [24]3 years ago
3 0
The equation is:
x * 20 + 0.12 * 60 = 0.10 * 80
20 x + 7.2 = 8
20 x = 8 - 7.2
20 x = 0.8
x = 0.8 : 20 = 0.04 ( or 4% )
Answer: B ) 0.04
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4 0
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Answer:

1. Exothermic.

2. -1598 kJ.

Explanation:

Hello!

1. In this case, according to the reaction, we can infer that 799 kJ of energy are evolved (given off, released) it means that the enthalpy of reaction is negative as the reactants have more energy than the products; which means this is an exothermic reaction.

2. Here, as we know that the enthalpy of reaction is -799 kJ/mol, we can compute the q-value as shown below, considering the reacted 2 moles of solid iron:

q=2mol*-799 kJ/mol\\\\q=-1598kJ

Which means that 1598 kJ of energy are evolved when 2 moles of solid iron react.

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