Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

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Which element's molar mass is closest to 1 g?

Hydrogen
Oxygen
Carbon
Helium

The correct answer is: Hydrogen

Hydrogen indeed has a molar mass that is closest to 1 g. The molar mass of hydrogen is approximately 1.008 g/mol, making it the lightest element on the periodic table. This lightweight characteristic is significant, especially in various chemical reactions, as it allows for a higher rate of kinetic activity and influences the properties of different compounds. In comparison, oxygen has a molar mass of about 16 g/mol, which is considerably higher than hydrogen. Carbon has a molar mass of approximately 12 g/mol, reflecting its position as a central element in organic chemistry. Helium, being a noble gas, has a molar mass around 4 g/mol, still more than that of hydrogen but lightweight nonetheless. Understanding these values is important for students in health and science fields as it relates to stoichiometry and the calculation of reactions involving different gases and elements.