What is a hydrocarbon? What is a hydrocarbon? It is a molecule derived from hydrogen synthesis. It is a wet carbon atom It is an
1 answer:
Answer:
The correct answer is :It is a molecule composed of carbon and hydrogen only.
Explanation:
Hydrocarbons are defined as compounds which majorly made up carbon and hydrogen.There three types of hydrocarbons:
- Alkanes : These are saturated hydrocarbons with single bond present in between two carbon atoms.The general structure of an alkane is:
- Alkene :These are unsaturated hydrocarbons with double bond present in between two carbon atoms.The general structure of an alkene is:
- Alkyne :These are unsaturated hydrocarbons with triple bond present in between two carbon atoms.The general structure of an alkyne is:
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Answer:
2.15 mg of uranium-238 decays
Explanation:
For decay of radioactive nuclide-
where N is amount of radioactive nuclide after t time, is initial amount of radioactive nuclide and
is half life of radioactive nuclide
Here ,
and
So,
so, N = 2.446 mg
mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg
First we have to find Ka1 and Ka2
pKa1 = - log Ka1 so Ka1 = 0.059
pKa2 = - log Ka2 so Ka2 = 6.46 x 10⁻⁵
Looking at the values of equilibrium constants we can see that the first one is really big compared to second one. so, the pH will be affected mainly by the first ionization of the acid.
Oxalic acid is H₂C₂O₄
H₂C₂O₄ ⇄ H⁺ + HC₂O₄⁻
0.0356 M 0 0
0.0356 - x x x
Ka1 =![\frac{[H^+][HC2O4^-]}{[H2C2O4]}](https://tex.z-dn.net/?f=%20%5Cfrac%7B%5BH%5E%2B%5D%5BHC2O4%5E-%5D%7D%7B%5BH2C2O4%5D%7D%20)
= x² / 0.0356 - x
x = 0.025 M
pH = - log [H⁺] = - log (0.025) = 1.6
pKa1 = - log Ka1 so Ka1 = 0.059
pKa2 = - log Ka2 so Ka2 = 6.46 x 10⁻⁵
Looking at the values of equilibrium constants we can see that the first one is really big compared to second one. so, the pH will be affected mainly by the first ionization of the acid.
Oxalic acid is H₂C₂O₄
H₂C₂O₄ ⇄ H⁺ + HC₂O₄⁻
0.0356 M 0 0
0.0356 - x x x
Ka1 =
x = 0.025 M
pH = - log [H⁺] = - log (0.025) = 1.6