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matrenka [14]
3 years ago
14

Please help I will give brainliest!

Chemistry
1 answer:
Fiesta28 [93]3 years ago
7 0

Answer:

b, H2O(s) r H2O(g)

Explanation:

entropy is heat, so increase in heat would mean water gets evaporated or melted, or both in this case. so the only choice above that showed increase in heat is from solid(ice) to gas(water vaper) due to increase in heat in the reaction.

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Determine the molarity of 56.00 grams of aluminum nitrate in 450 milliliters of solution?
SVETLANKA909090 [29]

Answer:

4.62 M

Explanation:

Molarity = moles/volumes (L), so you need to find the moles and the volumes in liters.

Finding the volume is easy because you just have to convert mL to L, so the volume is 0.45 L

Next, find the moles. You can do this by using the molar mass of aluminum to convert the grams to moles. The molar mass of aluminum is 26.98 g/mol.

56 g * (1 mol/26.98 g) = 2.08 mol

Now, divide the moles (2.08) by the volume (.45 L)

Molarity = 4.62 M

3 0
3 years ago
In the clinical laboratory, testing to identify specific porphyrins is performed using Group of answer choices Fluorometric emis
ziro4ka [17]

Answer:

Fluorometric emission scanning.

Explanation:

Fluorometric emission scanning is used to detect the presence of porphyrins. There are various types of porphyrins and they can be tested in a lab with either, urine or blood sample testing.

8 0
3 years ago
John dalton said that all atoms are identical in size and mass. explain why this is incorrect.
andrew11 [14]
This question can be explained in a variety of ways, but the easiest can be that elements exist, and since each has a different atomic mass, all atoms are not identical in size and mass.
4 0
3 years ago
Calculate the mass of calcium carbide produced if 1770 kJ of heat is absorbed.
Flauer [41]

Answer:

m=243.72g

Explanation:

Hello,

For the given chemical reaction:

CaO(s) + 3 C(s) \rightarrow CaC_2(s) + CO(g)

Whose heat of reaction is 464.8 kJ/mol which means that energy is absorbed due to the chemical reaction, we can compute the moles of calcium carbide via the following relationship:

n=\frac{1770kJ}{464.8 kJ/mol}\\ \\n=3.81mol

Then, since the molar mass of calcium carbide is 64 g/mol, the yielded mass turns out:

m=3.81mol*\frac{64g}{1mol}\\ \\m=243.72g

Best regards.

7 0
3 years ago
What is the [H3O+]in a solution of pOH 0.253
Luda [366]
Carbonated water would be what you are looking for :v)
4 0
3 years ago
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