C. Formation of a new substance
<span>In a nuclear reaction, mass is converted to energy according to the famous relation E = mc^2
So the best answer is :
</span><span>C. During a chemical reaction, some of the mass of the reactants is converted to energy.</span>
Oxygen has 6 valence electrons, so B
Answer:
Explanation:
First, lets find the molar mass of CO². This is approximately 12 + 2(16) = 44 g/mol. Now, let's set up the conversions.
This is Avogadro's number
↓
243.6g CO² * (1 mol CO² /44g CO²) * (6.023 * 10^23 molecules/ 1 mol)
When we cancel out the units, we are left with 3.33 * 10^23 molecules of carbon dioxide. I hope this makes sense!