3.2 Calculations Flashcards
What is the formula that links mass, moles, and Mr?
Mass = moles x Mr
What is the mass of 0.25 moles of carbon dioxide (CO2)?
(Ar of C is 12, Ar of O is 16)
11g
How many moles are there in 72g of water (H2O)?
(Ar of H is 1, Ar of O is 16)
4 moles
How many moles are there in 10.2g of ammonia (NH3)? Give your answer as a decimal.
(Ar of N is 14, Ar of H is 1)
0.6 moles
0.040 moles of an unknown compound is found to have a mass of 3.28 g.
Find the relative formula mass of the compound.
82
1.4 moles of an unknown compound is found to have a mass of 39.2 g.
Find the relative formula mass of the compound.
28
What is the mass of 4 moles of nitrogen gas (N2)?
(Ar of N is 14)
112g
What is Avogadro’s constant
6.02x10^23
What is a mole
A unit of measurement for a chemical amount
The mass of Avogandro’s constant is the same number as what
A chemical substances relative formula mass in grams
True or False:
1 mol of any substance: 6.02x10^23 particles of a substance
True
What is Ar
The relative atomic mass (top number on the periodic table for an element)
Where is the Ar on an element in the periodic table
Top number (larger number)
How many atoms/ molecules are in 1 mol of Carbon
6.02x10^23
Avogadro’s constant
What can be said to remember the order of the equation that includes moles Mr and mass
Mr Mole has a heavy bag
Mr x mole = mass
