Chapter 5 - Quantifying Chemistry

Question 1

what is avogadros number?

Answer 1

6.022 x 10^23

Question 2

what is the symbol for avogadros number

Answer 2

N_A

Question 3

how was the relative mass scale derived?

Answer 3

Carbon-12 was used as it was stable, abundant and had the same amount of protons,neutrons and electrons. Scientists estimate that in 12g of carbon-12, there is 6.02 x 10^23 atoms. This is now known as one mole. So, an elements molar mass is the mass of one mole of it relative to the 12g of Carbon-12 used originally.

Question 4

what is the calculation pyramid

Answer 4

grams you have
————————–
#moles|||||||molar mass

Question 5

no of molecules of a compound=

Answer 5

number of moles x avogadros number

Question 6

molar mass=

Answer 6

periodic table mass

periodic table masses added up for all of the compound

Question 7

no of moles=

Answer 7

grams you have/molar mass

Question 8

grams you have=

Answer 8

moles x molar mass

Question 9

the amount of a substance you have should always be in…

Answer 9

grams

Question 10

how do u calculate RAM

Answer 10

100

Question 11

total number of atoms in a compound=

Answer 11

number of molecules x number of atoms in one molecule