The element nitrogen has an atomic weight of 14.0 and consists of two stable isotopes nitrogen-14 and nitrogen-15. The isotope nitrogen-14 has a mass of 14.0 amu and a percent natural abundance of 99.6 %. The isotope nitrogen-15 has a percent natural abundance of 0.370 %. What is the mass of nitrogen-15? amu

Answer :  The mass of nitrogen-15 is, 15.1 amu

Explanation :

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

  .....(1)

For isotope:

Mass of isotope = 14.0 amu

Fractional abundance of isotope = 99.6 % = 0.996

For isotope:

Mass of isotope = ?

Fractional abundance of isotope = 0.370 % = 0.00370

Average atomic mass of nitrogen = 14.0 amu

Now put all the given values in equation 1, we get:

Therefore, the mass of nitrogen-15 is, 15.1 amu

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

if you mean hydrogen and oxygen then water is the product