Question

carbon has three isotopes. carbon-12 carbon-13 carbon-14 which isotope has more protons? carbon-12 carbon-13 carbon-14 they are the same calculate the relative atomic weight of chlorine with the following information chlorine-35 percent abundance 75% chlorine-37 percent abundance 25% your answer

Explanation:

Step1: Recall definition of isotopes

Isotopes of an element have the same number of protons. Carbon - 12, carbon - 13 and carbon - 14 are all isotopes of carbon. So they have the same number of protons.

Step2: Calculate relative atomic weight of chlorine

The formula for relative atomic weight ($A_r$) is $A_r=\sum_{i} (m_i\times p_i)$, where $m_i$ is the mass number of the isotope and $p_i$ is its percent - abundance (in decimal form). For chlorine, $m_1 = 35$, $p_1=0.75$, $m_2 = 37$, $p_2 = 0.25$. Then $A_r=(35\times0.75)+(37\times0.25)=26.25 + 9.25=35.5$.

Answer:

1. D. They are the same
2. 35.5