Question

Calculate the average atomic mass of bromine. One isotope of bromine has a molar mass of 78.92 g/mol and a relative abundance of 50.69%. The other major isotope of bromine has a molar mass of 80.92 g/mol and a relative abundance of 49.31%.

Answer 1

The average atomic mass of bromine, considering its isotopes 79Br and 81Br, is calculated by converting the relative abundances to decimals, multiplying each by the respective isotope's mass, and summing the results, which gives approximately 79.8992 amu.

Step-by-step explanation:

To calculate the average atomic mass of bromine, you need to take into account the mass and relative abundance of each isotope. The calculation involves converting the percent abundances to decimal form and then multiplying each by the isotope's respective mass. After that, you add these values together to get the average atomic mass.

Using the given data for the isotopes of bromine:

• 79Br: mass = 78.9183 amu, abundance = 50.69%
• 81Br: mass = 80.9163 amu, abundance = 49.31%

Convert the percentages to decimals and multiply:

(78.9183 amu * 0.5069) + (80.9163 amu * 0.4931) = 39.99468 amu + 39.90452 amu

Add the weighted masses:

39.99468 amu + 39.90452 amu = 79.8992 amu

Thus, the average atomic mass of bromine is approximately 79.8992 amu.

Answer 2

The answer is 1.55g/ml .
the formula you use is d=m/v
m is for mass v is for volume