Question 2 of 10 Why is the average atomic mass used when calculating grams of a
substance?
A. The elements in the substance are mixtures of their isotopes.
B. The average atomic mass is known to more significant figures.
C. The number of isotopes in the sample is constantly changing.
D. The exact weights of the isotopes are not known.
SUBMIT

Ireally don’t know bruh

The mole ratio of hydrogen to ammonia is 3: 2.

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.