Naturally occurring element X exists in three isotopic forms X-28 (27.977 amu 02 23% abundance) X-29...

Question

Question

science chemistry

Answer 1

Answer #1

Atomic weight can be calculated by using following formula

atomic weight= mass_a × fract_a + mass_b × frac_b+ mass_c × frac_c

Where, a,b and c are used for first,second and third isotopes.

We need to convert percentage into fractions by dividing each percentage term by 100.

Now,

Atomoic weight = 27.977 × 0.9223 + 28.976 × 0.04679 + 29.974 × 0.031

= 25.8031871 + 1.35578704 + 0.929194

= 28.0881681

= 28.09 amu

Therefore, first option is the right option.

Answer 2

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