How many atoms are there in 5.7 mol of hafnium

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

What statement goes against the kinetic theory of gases

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon