The answer is a. Chemical change.
69 mmHg pressure is exerted by oxygen if 40% of the gas pressure is exerted by the oxygen gas.
<h3>What is pressure?</h3>
Pressure is defined to be the amount of force exerted per area
40% of pressure is exerted by oxygen gas.
So, 60% of pressure will be exerted by carbon dioxide gas.
60% of 115 mmHg = 69 mmHg
Hence, 69 mmHg pressure is exerted by oxygen if 40% of the gas pressure is exerted by the oxygen gas.
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Answer: 14.0 moles of carbon.
Explanation: Using the Avogadro's number,
6.02 x 10^23 atoms -----> 1 mole of carbon .
8.43 x 10^24 atoms ----> 8.43 x 10^24/ 6.02 x 10^23 = 14.0moles of carbon.
To go from grams to atoms, you first have to convert to moles and them to atoms. To do that, divide the amount in grams by the atomic weight (141.95 in this case) and then multiply by avagadros number (6.022×10^23). After you do all of this, you should get 8.06×10^20.