relative Atomic and relative Molecular Mass

Calculate the relative atomic mass of an element if it consists of 90% of isotope A (atomic mass 10) and 10% of isotope B (atomic mass 12).

• 10.5

• 11.0

• 9.8

• 10.2

Determine the relative molecular mass of H2O.

• 20

• 18

• 22

• 16

Tags

NGSS.MS-PS1-1

What is the average atomic mass of an element if it consists of 75% of isotope X (atomic mass 20) and 25% of isotope Y (atomic mass 22)?

• 21

• 20

• 19

• 23

Calculate the molar mass of CO2.

• 36.01 g/mol

• 50.02 g/mol

• 28.02 g/mol

• 44.01 g/mol

If an element has three isotopes with atomic masses 10, 11, and 12, and their abundances are 20%, 30%, and 50% respectively, what is the average atomic mass?

• 11.3

• 12.2

• 10.5

• 11.8

Find the relative molecular mass of CH4.

• 22.990

• 18.015

• 12.011

• 16.043

What is the molar mass of NaCl?

• 58.44 g/mol

• 55.84 g/mol

• 60.44 g/mol

• 63.44 g/mol

If an element has two isotopes with atomic masses 16 and 18, and their abundances are 75% and 25% respectively, what is the average atomic mass?

• 16.5

• 15.5

• 17.5

• 16.75

Calculate the relative atomic mass of an element with isotopes of atomic masses 14 and 16, and their abundances are 60% and 40% respectively.

• 14.8

• 14.3

• 15.2

• 13.5

Determine the molar mass of H2SO4.

• 72.63 g/mol

• 36.46 g/mol

• 98.09 g/mol

• 58.44 g/mol