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Olenka [21]
3 years ago
5

Which of the following measurements is used to measure the enthalpy of combustion? A. None of these B. Measuring the change in t

emperature when two liquids are mixed. C. It cannot be measured, only calculated using the equation: q = mc∆T. D. Measuring the change in temperature of a beaker of water.
Chemistry
1 answer:
DaniilM [7]3 years ago
4 0

Answer: Option (C) is the correct answer.

Explanation:

In a substance, the total energy of its molecular motion is known as heat. Whereas when we measure the average energy of molecular motion of a substance then it is known as temperature.

So, any increase or decrease in temperature will lead to change in heat of a substance.

When one mole of a substance is burned then the amount of energy released  in the form of heat is known as heat of combustion.

Relation between heat and temperature is as follows.

                    q = m \times C \times \Delta T

Thus, we can conclude that to measure the enthalpy of combustion it cannot be measured, only calculated using the equation; q = mc \Delta T.

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If you have 1.5 grams of silver nitrate, how many grams of silver could<br> you produce?
Sunny_sXe [5.5K]

Answer:

0.95g of Ag we can produce

Explanation:

To solve this question we have to convert the mass of silver nitrate (AgNO₃) to moles. The moles of silver nitrate = Moles of Ag. Then, with molar mass of Ag we can know the mass of silver:

<em>Moles AgNO₃ -Molar mass: 169.87g/mol-:</em>

1.5g * (1mol / 169.87g) = 0.0088 moles Ag

<em>Mass Ag -Molar mass: 107.87g/mol-:</em>

0.0088 moles Ag * (107.87g / mol) =

<h3>0.95g of Ag we can produce</h3>
7 0
2 years ago
A compound is found to contain 26.73 % phosphorus, 12.09 % nitrogen, and 61.18 % chlorine by mass. What is the empirical formula
Mrrafil [7]

Answer:

PNCl_2

Explanation:

Hello!

In this case, when determining empirical formulas by knowing the by-mass percent, we first must assume the percentages as masses so we can compute the moles of each element:

n_P=\frac{26.73g}{30.97g/mol}=0.863mol\\\\n_N=\frac{12.09g}{14.01g/mol}=0.863mol\\\\n_C_l=\frac{61.18g}{35.45g/mol}=1.726mol

Now, for the determination of the subscript of each element in the empirical formula, we divide the moles by the fewest moles (P or N):

P=\frac{0.863mol}{0.863mol}=1\\\\N= \frac{0.863mol}{0.863mol}=1\\\\Cl=\frac{1.726mol}{0.863mol}2

Thus, the empirical formula is:

PNCl_2

Regards!

4 0
2 years ago
How many moles are equivalent to 300.0 grams of Uranium?
Sveta_85 [38]

Answer:

There are 1.260 moles for every 300.0 grams of Uranium

Explanation:

8 0
2 years ago
Which of the following DOES NOT have 2 significant
Elanso [62]

Answer:

1.001

Explanation:

The Significant Figures are 1 0 0 1, This answer has 4 Significant figures, while the other three have only 2 significant figures

7 0
3 years ago
What element is found in liver and is needed to prevent anemia or tired blood.
DochEvi [55]


The element found in the liver that helps prevent anemia is iron.

Iron is an essential element for blood production. Close to 70% of the body's iron is found in the red blood cells. In the red blood cells it is a vital ingredient of hemoglobin, the red pigment that gives blood its red color. In the muscle cells, iron is found as myoglobin.

Iron is stored mostly in the liver as ferritin or hemosiderin.

When iron stores are finished or exhausted, the condition is called iron depletion. When the shortage of iron is severe, it results in a condition known as iron deficiency anemia whereby the red blood cells do not have enough hemoglobin.



3 0
3 years ago
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