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Lunna [17]
3 years ago
12

Define functional group

Chemistry
1 answer:
PIT_PIT [208]3 years ago
3 0

Answer:

a functional group is a specific group of atoms or bonds within a compound that is responsible for the characteristic chemical reactions of that compound.

Explanation:

mark as brainliest!!

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Calculate the molarity of a 10.0% (by mass) aqueous solution of hydrochloric acid.
olga2289 [7]

The question is incomplete,the complete question :

Calculate the molality of a 10.0% (by mass) aqueous solution of hydrochloric acid:

a) 0.274 m

b) 2.74 m

c) 3.05 m

d) 4.33 m

e) the density of the solution is needed to solve the problem

Answer:

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

Explanation:

10.0% (by mass) aqueous solution of hydrochloric acid.

10 grams of HCl is present in 100 g of solution.

Mass of HCl = 10 g

Mass of solution = 100 g

Mass of solution = Mass of solute + Mass of water

Mass of water = 100 g - 10 g = 90 g

Moles of HCl = \frac{10 g}{36.5 g/mol}=0.2740 mol

Mass of water in kilograms = 0.090 kg

Molality = \frac{0.2740 mol}{0.090 kg}=3.05 mol/kg

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

6 0
3 years ago
How many neutrons does element ex have if it's atomic number is 58 and it's mass numbers 156
MariettaO [177]
It would have 98 neutrons.

Explanation:
The formula for finding neutrons when given the atomic number and the mass is to do (mass - atomic number.) In this case, the mass is 156 and the atomic number is 58. So we subtract 156 - 58, which gives us 98. Therefore, it would have 98 neutrons.
4 0
3 years ago
Will the composition of water molecules vary depending on their source?
Alecsey [184]

Answer:

It does not matter where the sample of water came from or how it was prepared. Its composition, like that of every other compound, is fixed.

6 0
3 years ago
Acetylene, C2H2, burns according to the following reaction: C2H2 5O2 --> 4CO2 2H2O. Suppose 1.20 g of C2H2 is mixed with 3.50
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3. Describe air using the terms: mixture, atoms, and molecules.<br> I
alina1380 [7]
Air is a mixture of elements which are formed my atoms that forms molecules. Hope that helps!
5 0
3 years ago
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