Question

chromium has the following isotopic masses and % abundances: 49.9 amu 4.35% 51.9 amu 83.79% 52.9 amu 9.50% 53.9 amu 2.35% calculate the relative atomic mass of chromium using 2 decimals in your answer.

Explanation:

Step1: Convert percentages to decimals

$4.35\% = 0.0435$, $83.79\%=0.8379$, $9.50\% = 0.0950$, $2.35\%=0.0235$

Step2: Calculate the contribution of each isotope

For the first isotope: $49.9\times0.0435 = 2.17065$
For the second isotope: $51.9\times0.8379 = 43.58701$
For the third isotope: $52.9\times0.0950 = 5.0255$
For the fourth isotope: $53.9\times0.0235 = 1.26665$

Step3: Sum up the contributions

$2.17065 + 43.58701+5.0255 + 1.26665=52.05$

Answer:

$52.05$