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3 years ago

What molecules are found in all or almost all organic compounds?

Chemistry

2 answers:

klemol [59]3 years ago

5 0

D. carbon and hydrogen

Gnoma [55]3 years ago

4 0

Answer: The correct answer is Option d.

Explanation:

Organic compounds are defined as the compounds which are found in living organisms.

These compounds mainly consists of carbon atoms which are covalently bonded to hydrogen, oxygen and nitrogen atoms.

For Example: $C_{5}H_{11}O,HCN$

Both the compounds are organic compounds because carbon is bonded to nitrogen, oxygen and hydrogen atoms.

Main elements present in any organic compound are carbon and hydrogen.

Hence, the correct answer is Option d.

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When aqueous solutions of Na2SO4 and Pb(NO3)2 are mixed, PbSO4 precipitates. Calculate the mass of PbSO4 formed when 1.25 L of 0

neonofarm [45]

Answer:

The mass of PbSO4 formed 15.163 gram

Explanation:

mole of Pb(NO₃)₂ = 1.25 x 0.05 = 0.0625

mole of Na₂SO₄ = 2 x 0.025 = 0.05

Pb(NO₃)₂ + Na₂SO₄ → PbSO₄ + 2 NaNO₃

( Mole/Stoichiometry ) $\frac{0.0625}{1}$ $\frac{0.05}{1}$

= 0.0625 = 0.05

From (Mole/ Stoichiometry ) we can conclude that Na₂SO₄ is limiting reagent.

Mass of PbSO₄ precipitate = 0.05 x Molecular mass of PbSO₄

= 0.05 x 303.26 g

= 15.163 g

7 0

2 years ago

Given the standard enthalpy changes for the following two reactions:

lawyer [7]

Answer:

ΔH° = -186.2 kJ

Explanation:

Hello,

This case in which the Hess method is applied to compute the required chemical reaction. Thus, we should arrange the given first two reactions as:

(1) it is changed as:

SnCl2(s) --> Sn(s) + Cl2(g)...... ΔH° = 325.1 kJ

That is why the enthalpy of reaction sign is inverted.

(2) remains the same:

Sn(s) + 2Cl2(g) --> SnCl4(l)......ΔH° = -511.3 kJ

Therefore, by adding them, we obtain the requested chemical reaction:

(3) SnCl2(s) + Cl2(g) --> SnCl4(l)

For which the enthalpy change is:

ΔH° = 325.1 kJ - 511.3 kJ

ΔH° = -186.2 kJ

Best regards.

7 0

3 years ago

Read 2 more answers

Please someone help mee

Nikitich [7]

Answer:

13.9kj/mol

Explanation:

$h = 891 -(393.5 +2*241.8)=1768.1=13.9kj/mol$

8 0

2 years ago

I need help with this pls

coldgirl [10]

Answer:

C Is The Correct Answer Because The Deeper The Rock Is The Older It Is So The Top Is The Youngest And The Bottem Is The Oldest

8 0

3 years ago

Which statement best explains why heating a liquid affects its velocity

nekit [7.7K]

Part of the answer you are looking for may be- Molecules overcome attractions easily and at high temperatures, move faster- (paraphrased from Google) Since the question asked was not provided with the statements as proposed in the original question, I cannot give you an exact answer. I did what i could do, hope this helps!

3 0

2 years ago