multiple choice question\nhydrogen has an atomic weight of 1amu and oxygen has an atomic weight of 16amu…
multiple choice question\nhydrogen has an atomic weight of 1amu and oxygen has an atomic weight of 16amu. what is the molecular weight of water (h₂o)?\n32amu\n2amu\n12amu\n18amu
Answer
Explanation:
Step1: Calculate hydrogen's contribution
There are 2 hydrogen atoms in $H_2O$, and each hydrogen has an atomic weight of 1 amu. So the total weight of hydrogen is $2\times1$ amu = 2 amu.
Step2: Add oxygen's weight
Oxygen has an atomic weight of 16 amu in $H_2O$. The molecular weight of $H_2O$ is the sum of the weights of hydrogen and oxygen, so it is $2 + 16$ amu = 18 amu.
Answer:
18amu (corresponding to the last option in the multiple - choice list)