Chapter 7- Quantifying atoms and compounds

Question 1

what does the mole mean

Answer 1

6.02 x 10 to the power of 23

Question 2

what is a mole the same as

Answer 2

the number of particles as there is atoms in 12 grams of pure carbon 12

Question 3

what is the formula to calculate the number of particles (N)

Answer 3

N = n x NA
Na (avogadros number)
n (number of moles)

Question 4

what is molar mass

Answer 4

the mass of one mole of a particular element or compound

Question 5

what is the symbol for molar mass

Answer 5

M

Question 6

what is the unit for molar mass

Answer 6

g/mol

Question 7

What is the formula to calculate the percentage composition

Answer 7

% of an element=
mass of element in 1 mol of compound
—————————————————-x100
mass of compound in 1 mol of compound

Question 8

what is the empirical formula

Answer 8

a formula with the simplest whole number ratio of elements which are fund in the compound

Question 9

steps to calculate empirical formula

Answer 9

1- determine mass of each element
2- determine no. of moles of each element
3- divide by the smallest value
4- convert ratios into compound

Question 10

what is the molecular formula

Answer 10

gives the actual number of atoms of an element present in a molecule

Question 11

steps to determine molecular formula

Answer 11

1- determine empirical formula of compound
2- determine molar mass of empirical formula
3- divide molar mass compound by empirical formula mass
4- multiply empirical formula by this amount