Mass Spectrometer

What do the peaks on the mass spectrum represent?

• anions
• different isotopes
• atoms with differing numbers of electrons
• numbers of electrons

Which element does this mass spectrum most likely represent?

• neon

• scandium

• boron

• sodium

What do the heights of the peaks represent in the mass spectrum?

• number of isotopes
• relative abundance of each isotope
• average atomic mass
• charge:mass ratio

How many isotopes are shown in this mass spectrum?

• 1
• 84
• 86
• 4

What do you expect the molar mass to be for this element?

• 91.4 g/mol
• 90.0 g/mol
• 4 g/mol
• 50. g/mol

Tags

NGSS.HS-PS1-7

How many isotopes of this element are shown in the mass spectrum?

• 98
• 7
• 100
• 95.9 g/mol

Tags

NGSS.HS-PS1-8

A sample of pure chlorine gas is analyzed in the MS. Which of the following is a correct interpretation?

• Chlorine has an isotope with a mass of 70 amu
• Chlorine has three known isotopes
• Chlorine is diatomic
• Chlorine is highly reactive

Based on the mass spectrum, which isotope of chlorine is most abundant?

• ³⁵Cl
• ³⁷Cl
• ⁷⁰Cl
• ⁷²Cl

Tags

NGSS.HS-PS1-8

Use your periodic table.  There are two isotopes of rubidium: ⁸⁵Rb and ⁸⁷ Rb. Which is more abundant?

• equally abundant
• rubidium-85
• rubidium-85.47
• rubidium-87

Tags

NGSS.HS-PS1-1

What is the average atomic mass for this element?

• 10 amu
• 10.8 amu
• 19.9 amu
• 11 amu