the mean (average) relative mass of an atoms of elements compared with the standard carbo atom
1 of 10
calculate the relative atomic mass of chlorine?
chlorine has two isotopes 35Cl (abundance of 75%) and then 37Cl (abundance of 25%)
(35 x 75) + (37 x 25) / 100 = 35.5
2 of 10
wat is the relative formula mass?
it is when you add together the A r values for all the atoms of each element present.
3 of 10
what is the relative formula mass of sodium hydroxide , NaOH? A; Na= 23 O= 16 H=1
23 + 16 + 1 = 40
Mr= 40
4 of 10
how do we calculate the number of moles ?
moles = mss / Mr
5 of 10
what s the Avogadro's constant ?
6.02 x10 *23
6 of 10
how many moles are in 2.2g of carbon dioxide , CO2. Mr =44 ?
2.2 / 40 = 0.05 mol
7 of 10
what do balanced symbol equations tell us?
they tell us the number of moles of a substance involved in chemical reactions.
8 of 10
what can you use balanced symbol equations for ?
to calculate the masses of reactants and products in chemical reactions
9 of 10
the balanced symbol equation for the reaction between calcium and oxygen is : 2Ca + O2 -- 2CaO.
how many moles of calcium atoms react with the one mole of oxygen?
2 moles react with the ne mole of oxygen
10 of 10
Other cards in this set
Card 2
Front
calculate the relative atomic mass of chlorine?
Back
chlorine has two isotopes 35Cl (abundance of 75%) and then 37Cl (abundance of 25%)
(35 x 75) + (37 x 25) / 100 = 35.5
Card 3
Front
wat is the relative formula mass?
Back
Card 4
Front
what is the relative formula mass of sodium hydroxide , NaOH? A; Na= 23 O= 16 H=1
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