Gallium (Ga) consists of two naturally occurring isotopes with masses of 68.926 and 70.925 amu. The average atomic mass of Ga is 69.72 amu. Calculate the abundance of each isotope.

Magnesium has three naturally occurring isotopes. 24 Mg (isotopic mass 23.9850 amu. abundance 78.99%) 25 Mg (isotypic mass 24.9858 amu, abundance 10.00%), and 26 Mg (isotopic mass 25.9826 amu, abundance 11.01%) Calculate the atomic mass of magnesium.

Gallium, which has an atomic mass of 69.723 amu, has two naturally occurring isotopes, Ga-69 and Ga-71. Which isotope occurs in greater abundance? Explain.

The two isotopes of carbon are ¹²C and ¹³C. About 98.93% of all carbon atoms are ¹²C, with a mass of 12.0000 amu and the remaining 1.07% of carbon atoms are ¹³C, with a mass of 13.0033 amu. The average mass of carbon is _________.

The average atomic mass of Ga is 69.72 amu. Calculate the abundance of each isotope.

Silver has two isotopes, 107/47 Ag has a mass of 106.905 amu (52.00%), and 109/47 Ag has a mass of 108.905 amu (48.00%). What is the atomic mass of silver?

Gallium has two naturally occurring isotopes: gallium-69 1isotopic mass = 68.92562 and gallium-71 1isotopic mass = 70.92472. The atomic weight of gallium is 69.7231.

(a) Without doing any calculations, state which isotope has the greater abundance.

(b) Calculate the percent abundance of each isotope.

The element gallium has two stable isotopes: ${ }^{\infty 9} \mathrm{Ga}$ with an atomic mass of $68.92 \mathrm{u}$ and ${ }^{71} \mathrm{Ga}$ with an atomic mass of $70.92 \mathrm{u}$. A periodic table shows that the chemical atomic mass of gallium is $69.72 \mathrm{u}$. What is the percent abundance of ${ }^{69} \mathrm{Ga}$ ?

Gallium has two naturally occurring isotopes, ${ }^{69} \mathrm{Ga}$ (isotopic mass $68.9256 \mathrm{amu}$, abundance $60.11 \%$ ) and ${ }^{71} \mathrm{Ga}$ (isotopic mass $70.9247 \mathrm{amu}$, abundance $39.89 \%$ ). Calculate the atomic mass of gallium.

Gallium (Ga) consists of two naturally occurring isotopes with masses of 68.926 and 70.925 amu. The average atomic mass of Ga is 69.72 amu. What is the percent composition of each isotope of gallium?

Gallium (Ga) consists of two naturally occurring isotopes with masses of $68.926$ and $70.925$ amu.

How many protons and neutrons are in the nucleus of each isotope? Write the complete atomic symbol for each, showing the atomic number and mass number.

A certain element $X$ forms a compound with oxygen in which there are two atoms of $X$ for every three atoms of $\mathrm{O}$. In this compound, $1.125 \mathrm{~g}$ of $X$ are combined with $1.000$ $\mathrm{g}$ of oxygen. Use the average atomic mass of oxygen to calculate the average atomic mass of $X$. Use your calculated atomic mass to identify the element $X$.

(a) Indium has two naturally occurring isotopes: indium-113 and indium-115. The relative atomic mass of indium is $114.82$. Calculate the natural abundance of each isotope.

b Gallium has two naturally occurring isotopes: gallium-69 and gallium-71. The relative atomic mass of gallium is $69.723$. Calculate the natural abundance of each isotope.

Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What is the amu of the other isotope
a) 70.924 amu
b) 70.928 amu
c) 70.932 amu
d) 70.920 amu