You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VIII

Chemistry

Atomic Mass

Mg has three ...

Question

Mg has three natural isotopes whose isotopic masses and relative abundances are respectively 23.98 (78.60%), 24.98(10.11%) and 25.98(11.29%). The atomic mass of Mg will be

23.42u

No worries! We‘ve got your back. Try BYJU‘S free classes today!

24.31u

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

24.95u

No worries! We‘ve got your back. Try BYJU‘S free classes today!

23.95u

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B
24.31u

Atomic mass of Mg

$23.98 \times \frac{78.6}{100}$ + $24.98 \times \frac{10.11}{100}$ + $25.98 \times \frac{11.29}{100}$
= 18.85 + 2.53 + 2.93 = 24.31u

Suggest Corrections

Similar questions

Q. In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are

_{12}^{24} M g

(23.98504u),

_{12}^{25} M g

(24.98584u) and

_{12}^{26} M g

(25.98259u). The natural abundance of

_{12}^{24} M g

is 78.99% by mass. Calculate the abundances of other two isotopes.

Q. What is the average atomic mass of Mg if the naturally occurring isotopes are

^{24} M g

^{25} M g

and

^{26} M g

. Their masses and abundances are as follows:

\begin{matrix} Isotope & Atomic Mass & Isotopic abundance^{24} M g & 23.98504 & 78.70 %^{25} M g & 24.98584 & 10.13 %^{26} M g & 25.98259 & 11.17 % \end{matrix}

Q. Substance

X

has three common isotopes:

X - 48, X - 49

and

X - 51

. If the relative abundances of these three isotopes are

42

38

% and

20

% respectively, what is the atomic mass of substance

X

1)carbon has,3 isotopes of atomic mass unit 12. 0 u and 13. 0 u and 14 u the relative abundance of these three isotopes are 98. 8 9 and 1. 10 and 2x10-10 respectively find out the average atomic mass of carbon?

Q. Calculate the reported average elemental atomic mass of

M g

, if the naturally occurring isomers are

^{24} M g,^{25} M g, a n d^{26} M g

. Their masses and abundance are as follows:

\begin{matrix} Isotope & Atomic Mass & Isotopic Abudance^{24} M g & 23.98504 & 78.70 %^{25} M g & 24.98584 & 10.13 %^{26} M g & 25.98259 & 11.17 % \end{matrix}

Join BYJU'S Learning Program

Mg has three natural isotopes whose isotopic masses and relative abundances are respectively 23.98 (78.60%), 24.98(10.11%) and 25.98(11.29%). The atomic mass of Mg will be

The correct option is B 24.31u Atomic mass of Mg 23.98×78.6100 + 24.98×10.11100 + 25.98×11.29100 = 18.85 + 2.53 + 2.93 = 24.31u

The correct option is B
24.31u

Atomic mass of Mg

$23.98 \times \frac{78.6}{100}$ + $24.98 \times \frac{10.11}{100}$ + $25.98 \times \frac{11.29}{100}$
= 18.85 + 2.53 + 2.93 = 24.31u