3 - Quantitive chemistry Flashcards
1
Q
What is the relative formula mass (M r)
A
It sum of the relative atomic mass (Ar) values
2
Q
What is the relative formula mass for carbon monoxide (CO)?
A
Ar of carbon = 12
Ar of oxygen = 16
12+16 = 28
3
Q
How do you calculate moles?
A
moles = mass/Mr
4
Q
How many moles in 24g of Lithium?
A
Mr of Lithium = 7
24/7 = 3.4
5
Q
Calculate the mass of 1.5 moles of Na2O
A
Ar of sodium = 23
Ar of oxygen = 16
23x2 = 46
46+16 = 62
1.5x62 = 93
6
Q
What is the law of conservation of mass?
A
No atoms are lost or made in a chemical reaction
7
Q
What is the equation for the concentration of a solution?
A
mass of solute/volume of solvent
8
Q
what is a solute?
A
dissolved substance in a solution
9
Q
Wat is a solvent?
A
the liquid in which the solute is dissolved in
10
Q
What is a solution?
A
mixture formed by a solute and a solvent
