An element consists of two isotopes. One with a mass of 79.95 amu and an abundance of 29.9%. The second isotope has a mass of 81

Question

3 years ago

8

.95 amu with an abundance of 70.1%. What is the molar mass of this element?

1 answer:

galina1969 [7] · Answer 1 · 2022-05-21T19:31:29+03:00

the molar mass of the element is 81.36 g/mol

<u><em>calculation</em></u>

step 1 : multiply each %abundance of the isotope by its mass number

that is 79.95 x 29.9 =2391

81.95 x 70.1 = 5745

Step 2: add them together

2390.5 + 5744.7 =8136

Step 3: divide by 100

= 8136/100 = 81.36 g/mol