Question

Use the data given in the given table to calculate the molar mass of naturally occurring argon isotopes:Isotope³⁶Ar³⁸Ar⁴⁰ArIsotopic molar mass35.96755 g mol⁻¹ 37.96272 g mol⁻¹ 39.9624 g mol⁻¹Abundance0.337%0.063%99.600%

Answer 1

Explanation:

1 find the mole- Ar atomic no. 36

atomic mass. 72

mole= 0.337÷72= 0.0046

Ar atomic no. 38 and mass 76

mole =0.063÷ 76= 0.00082

similarly we can find mole of 3 rd. Ar is 1.25

then( 35.96755+37.96272+38.9624)÷ ( 0.0046+0.00082+1.25)

= 90.25