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dmitriy555 [2]
4 years ago
14

1 Mr. Chavez paid $14.32 total for 8 protein bars.

Chemistry
1 answer:
Gennadij [26K]4 years ago
4 0

Answer:

Option C. $1.79

Explanation:

From the question, were told that the total cost of 8 protein bar is $14.32.

Therefore, the cost of 1 protein bar will be = $14.32/8 = $1.79

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The standard heat of combustion of ethanol, C2H5OH, is 1372 kJ/mol ethanol. How much heat (in kJ) would be liberated by complete
Ivanshal [37]

Answer:

The correct answer is 596.5 kJ.

Explanation:

The mass of ethanol or C2H5OH mentioned in the question is 20 gm.  

The molar mass of ethanol is 46 g/mol.  

The moles of the compound can be determined by using the formula,  

n = weight of the compound/molar mass

= 20/46 = 0.435 moles

It is mentioned in the question that standard heat of combustion of ethanol is 1372 kJ/mole, that is, one mole of ethanol is producing 1372 kilojoules of energy at the time of combustion.  

Therefore, the energy liberated by completely burning the 20 grams of ethanol is 0.435*1372 = 596.5 kJ.  

4 0
3 years ago
Help? It would honestly mean a lot :(
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Answer:

1 1

5 2

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10 3

6 3

9 3

13 3

Explanation:

First of you add the subscripts (the little numbers after the letters) and multiply the big numbers before the letters together to get the number of atoms

For Example:

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6 0
3 years ago
State the observation made when hydrogen chloride gas is passed over ammonia gas
Zarrin [17]

Answer:

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6 0
3 years ago
What is the hydrogen concentration of a solution with a pH of 2.1?
Black_prince [1.1K]

Answer:

8×10^(-3) mol/L

Explanation:

The formula for finding the hydrogen ion concentration is...

[H⁺] = 10^-ph

[H⁺] = 10^(-2.1)

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The answer is to 1 significant digit because the pH has one decimal place.

5 0
3 years ago
the force of gravity between a plant and its moon is 371 N. if the planet has a mass of 4*1022kg and the moon has a mass of 5*10
pentagon [3]

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7 0
3 years ago
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