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slamgirl [31]
3 years ago
9

If you have a 2700 gram sample of C-14 and 12 half-lives have passed how much of your original sample

Chemistry
1 answer:
givi [52]3 years ago
8 0

Answer:

A ( t )=0.659 gram of C-14

Explanation:

Mathematically exponential decay can be expressed as

where

A ( t )   - the amount left after t years;

A 0  - the initial quantity of the substance that will undergo decay;

t 1/2  - the half-life of the decaying quantity.

Calculation:

Given that

A 0  =2700 gram sample of C-14

t=time=12 times of half life of C-14

Required data:

A ( t )=?

Putting value in the attached equation we get

A ( t )=0.659 gram of C-14

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The molar mass of vitamin A (C20H30O).
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Molar mass of C:  12.011 g/mol
The equation says C20, which means there are 20 carbon atoms in each molecule of Vitamin A.  So, we multiply 12.011 by 20 to get 240.22 g/mol carbon.

Molar mass of H:  1.0079 g/mol
The equation says C30, which means there are 30 hydrogen atoms in each molecule of Vitamin A. So, we multiply 1.0079 by 30 to get 30.237 g/mol hydrogen.

Molar mass of O: 15.999 g/mol
The equation says O without a number, which means there is only one oxygen atom in each molecule of Vitamin A.  So, we leave O at 15.999 g/mol.

Then, just add it up:
240.22 g/mol C + 30.237 g/mol H + 15.999 g/mol O = 286.456 g/mol C20H30O

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Ions stick together with<br> A . Covalent bonds <br> B. Negative bonds<br> C. Ionic bonds
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When CO2 and H2O react to form H2CO3, the number of bonds broken in H2O is ____ and in CO2 is _____. one; one
guapka [62]

CO2 and H2O react to form H2CO3 and two bonds are broken each in CO and H2O to form H2CO3.

<h3>What is chemical bonding?</h3>

Chemical bonding refers to the forces of attraction which hold atoms of the same or different elements together in order to form stable compounds or molecules .

Chemical bonding may be either ionic or covalent.

The greater the number of bonds in a compound, the more stable the compound.

During chemical reactions, bonds are broken and new binds are formed.

There are two bonds each in CO2 and H2O.

This, in the reaction between CO2 and H2O react to form H2CO3, , the number of bonds broken in H2O is two and in CO2 is two.

Learn more about chemical bonding at: brainly.com/question/819068

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2 years ago
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I don’t know sorry :(
6 0
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When 12 grams of carbon react with 32 grams of oxygen, the compound carbon dioxide (a greenhouse gas) is formed. What is true ab
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Answer:

Option C = 6 of carbon react with 16 g of oxygen.

Explanation:

In given question it is stated that 12 g  of carbon react with 32 g of oxygen to produce carbon dioxide. The other combination option c is also true because in this, the quantity of both reactant is just half from the given quantity. Which means that if 100 % product is obtained from the 12 g of carbon and 32 g of oxygen then by taking the half amount of reactant the product will be half i.e 50% .

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           C : O     1  : 2.6

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