Quantifying Chemistry (c5)

Question 1

What is Avogadro’s number?

Answer 1

6.02 x 10^23

Question 2

How do you find the relative atomic mass?

Answer 2

(RIM x abundance) / 100

Question 3

How do you find the percentage composition?

Answer 3

(Mass of X in a compound)/ x100

molar mass of compound

Question 4

What is the molecular formula of a compound?

Answer 4

It is the actual number of atoms that are present in a molecule of that substance.

Question 5

What is the empirical formula of a compound?

Answer 5

It is the simplest whole number ratio of atoms or irons that are present in the compound.

Question 6

How do you find the molecular formula?

Answer 6

(Molecular mass)/. x empirical formula

Empirical formula mass

Question 7

How do you find the number of atoms?

Answer 7

Molar mass x Avogadro’s number/ Na

Question 8

How do you find the mass of a molecule?

Answer 8

(Number of molecules)/ x molar mass

Na

Question 9

How do you find the number of moles?

Answer 9

Mass/

Molar mass

Question 10

How do you find the mass of moles?

Answer 10

Number of moles(n) x (M) molar mass

Question 11

How do you find the number of molecules?

Answer 11

Number of moles(n) x (Na) Avogadro’s number

Question 12

How do you find the mass of atoms?

Answer 12

Number of atoms/. x (M) molar mass

Na(Avogadro’s #)

Question 13

What does a mass spectrometer show us?

Answer 13

Information about the relative isotopic mass and percentage abundance of each isotope.