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4 years ago

Which formula represents a hydrocarbon? (1) CH3I (3) CH3CH3 (2) CH3NH2 (4) CH3OH

Chemistry

2 answers:

stealth61 [152]4 years ago

5 0

Contains only Carbon and Hydrogen.

(3) CH3CH3

Leviafan [203]4 years ago

4 0

Answer: The correct answer is Option 3.

Explanation:

Hydrocarbon is defined as the species in which a covalent bond is present between only hydrogen and carbon atoms. Presence of only hydrogen and carbon atoms is considered as a hydrocarbon.

From the given options:

Option 1: $CH_3I$

Here, a bond is present between carbon and iodine. Thus, it is not considered as a hydrocarbon.

Option 2: $CH_3NH_2$

Here, a bond is present between carbon and nitrogen. Thus, it is not considered as a hydrocarbon.

Option 3: $CH_3CH_3$

Here, a bond is present between carbon and hydrogen. Thus, it is considered as a hydrocarbon.

Option 4: $CH_3OH$

Here, a bond is present between carbon and oxygen. Thus, it is not considered as a hydrocarbon.

Hence, the correct answer is Option 3.

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3 years ago

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What is the percent composition of chromium in CrCl3?

maks197457 [2]

The oxidation state of Chromium chloride (III) is +3

How can we find the answer?

First of all write down what you know about the molecule:

1: The molecule hasn't got an electric charge (is not an ione), this means that either positive and negative charges of its atoms are balanced (we have the same number of positve and negative charges)

2: Since it's a salt, where the metal is chromium and the non metal is the alogen Chlorine, we know that the negative charge belogns to the non metal element because of its elettronegativity, therefore the positive charge belongs to the metale element (chromium).

3: when chlorin forms binary salts its oxidation state is always -1 (you can find out this info in a periodic table)

In CrCl3 we have 3 chlorine atoms where each of them carrys 1 negative charge, so the total amount of negative charges is -3

Since the charges are balanced, the question is: Which is the positive charge that Chromium must carry in order to balance 3 negative charges?

The answer comes out to +3

8 0

3 years ago

A fixed mass of gas has a volume of 92 cm cube and 3 degrees Celsius. What will be its volume at 18 degrees celsius if the press

8090 [49]

Answer:

94.8454

Explanation:

Let volume be V

Let Temperature be T

V1= 92

T1= 3C but to kelvin 273+3= 300K

V2= ?

T2= 18 C but to kelvin 18+273= 291

$\frac{v1}{t1} = \frac{v2}{t2}$

$\frac{92}{300} = \frac{v2}{291}$

$v2 \times 300 = 92 \times 291$

$v2 = \frac{92 \times 291}{300}$

$v2 = 94.8454$

3 0

3 years ago

To begin the experiment, a bomb calorimeter is filled with 1.11 g CH4 and an excess of oxygen. The heat capacity of the calorime

Flura [38]

There are several information's already given in the question. Based on those information's the answer can be easily determined.

M = 1.11 g CH4
C = 4.319 kJ g C⋅°
∆T = 35.65 - 24.85 degree centigrade
= 10.8 degree centigrade.
Then
∆H =−M ⋅ C ⋅∆T
= - 1.11 * 4.319 * 10.8
= - 51.776 kJ/mol

I hope the procedure is clear enough for you to understand.

6 0

3 years ago