All categories

4 years ago

How do carbon isotopes in fossil fuels differ from the atmosphere and from biomass?

1 answer:

4 0

Carbon bound in fossil fuels has different isotopes than carbon in atmosphere. Fossil fuels are underground and cosmic rays do not affect carbon in them same as atmosphere carbon. Carbon in fossil fuels that is underground longer than ten thousand years has only C-12 isotope and not C-14.

You might be interested in

When 6.040 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 18.95 grams of CO2 and 7.759 grams of H

algol [13]

Answer: The empirical formula is $CH_2$ and molecular formula is $C_4H_8$

Explanation:

We are given:

Mass of $CO_2$ = 18.95 g

Mass of $H_2O$ = 7.759 g

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 18.59 g of carbon dioxide, = $\frac{12}{44}\times 18.59=5.07g$ of carbon will be contained.

For calculating the mass of hydrogen:

In 18g of water, 2 g of hydrogen is contained.

So, in 7.759 g of water, = $\frac{2}{18}\times 7.759=0.862g$ of hydrogen will be contained.

Mass of C = 5.07 g

Mass of H = 0.862 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{5.07g}{12g/mole}=0.422moles$

Moles of H= $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.862g}{1g/mole}=0.862moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{0.422}{0.422}=1$

For H = $\frac{0.862}{0.422}=2$

The ratio of C : H = 1: 2

Hence the empirical formula is $CH_2$ .

The empirical weight of $CH_2$ = 1(12)+2(1)= 14 g.

The molecular weight = 56.1 g/mole

Now we have to calculate the molecular formula.

$n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{56.1}{14}=4$

The molecular formula will be= $4\times CH_2=C_4H_8$

6 0

3 years ago

Perform the following

stepan [7]

Answer:

.747

Explanation:

Answer can only have THREE sig dig because 12.9 has only three

9.635/12.9 = .747

8 0

2 years ago

Which kind of energy dose a stretched rubber band have

iragen [17]

The answer is potential energy...
Hope this helped :)

5 0

4 years ago

The movement of one body around another is

Umnica [9.8K]

The answer is Orbit.

6 0

4 years ago

Enter the chemical equation for the formation of Ca(NO3)2(s) from its respective elements in their standard states.

Afina-wow [57]

Answer:

Ca(s) + N₂(g) + 3O₂(g) → Ca(NO₃)₂ (s)

Explanation:

The reaction of the formation of Ca(NO₃)₂(s) , is as follows -

Ca + N₂ + O₂ → Ca(NO₃)₂

The above reaction , can be balanced by adding whole numbers ,

Hence , the balanced reaction is as follows -

Ca + N₂ + 3O₂ → Ca(NO₃)₂

The states of the respective molecules is -

the state at which the atoms are most stable or the state at which the atoms are most commonly found .

Hence ,

Calcium is most stable in solid state

Oxygen is most stable in gaseous state

Nitrogen is most stable in gaseous state

hence , the balanced reaction with all the states mentioned is as follows -

Ca(s) + N₂(g) + 3O₂(g) → Ca(NO₃)₂ (s) .

5 0

3 years ago