# Problem: Mass spectrometry is more often applied to molecules than to atoms. We will see in Chapter 3 in the textbook that the  molecular weight  of a molecule is the sum of the atomic weights of the atoms in the molecule. In mass spectrometry, these molecular weights are measured relative to 1/12 the mass of one atom of 12C and therefore are commonly referred to as relative masses. The mass spectrum of H2 is taken under conditions that prevent decomposition into H atoms.The two naturally occurring isotopes of hydrogen are 1H (atomic mass = 1.00783 amu; abundance 99.9885%) and 2H (atomic mass = 2.01410 amu; abundance 0.0115%).Which peak will be the largest?a) first peak (2.01566 amu) b) second peak (3.02193 amu) c) third peak (4.02820 amu)

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Mass spectrometry is more often applied to molecules than to atoms. We will see in Chapter 3 in the textbook that the  molecular weight  of a molecule is the sum of the atomic weights of the atoms in the molecule. In mass spectrometry, these molecular weights are measured relative to 1/12 the mass of one atom of 12C and therefore are commonly referred to as relative masses. The mass spectrum of H2 is taken under conditions that prevent decomposition into H atoms.

The two naturally occurring isotopes of hydrogen are 1H (atomic mass 1.00783 amu; abundance 99.9885%) and 2H (atomic mass 2.01410 amu; abundance 0.0115%).

Which peak will be the largest?

a) first peak (2.01566 amu)

b) second peak (3.02193 amu)

c) third peak (4.02820 amu)