A pure substance that cannot be separated into simpler substances by physical or chemical means. A pure substance composed of two or more elements that are chemically combined.
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.
1 mole = 18g water has 6.023*10^23 molecules
And therefore 12 g has 6.023*10^23/18*12 = 4*10^23
C ans
