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Title: Chemistry problem solutions
Description: It is a solution for all chemistry problems with solution
Description: It is a solution for all chemistry problems with solution
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include solids, one liquid (bromine) and gasses
...
• Metals are shiny, malleable and ductile - non-metals are not normally associated
with these properties
...
7
...
S
...
• Metal oxides are basic in nature - non-metal oxides are acidic
...
2
66
...
5
ratio (divide by
atomic mass)
26
...
87
14
...
87
= 1
...
87
66
...
87
35
...
87
= 1
...
87
7
...
44
1
...
44
= 3
...
87
divide by smallest
The empirical formula is NClH4 – probably ammonium chloride [NH4]+[Cl ]
−
8
...
008 = 2
...
The number of moles in 4
...
00g
2
...
98 mol
The molar mass of Cl2 is 2 × 35
...
90 g mol-1
...
00 g is:
number of moles =
mass (in g)
molar mass (in g mol −1 )
=
10
...
90g mol −1
= 0
...
There is more H2
present than can react with the amount of Cl2 – H2 is in excess and at the end of the
reaction (1
...
141) mol = 1
...
The amount of HCl that can be formed is controlled or limited by the amount of Cl2
available
...
As there is only 0
...
141 = 0
...
The
molar mass of HCl is 1
...
45 (Cl) = 36
...
The mass of HCl is therefore:
mass = number of moles (in mol) × molar mass (g mol-1)
= 0
...
458 g mol-1 = 10
...
The number of moles of sodium required to make 250 mL of a 0
...
100mol L−1 = 0
...
99 (Na)) + 12
...
00 (O)) g mol-1 = 105
...
0250 mol × 105
...
65 g
10
...
31 (Mg) + 16
...
31 g mol-1
...
00 g is:
number of moles =
mass (in g)
molar mass (in g mol −1 )
=
2
...
31g mol −1
= 0
...
0 mL of a 2
...
00mol L−1 = 0
...
To react with all of the MgO available
(0
...
0496) mol = 0
...
Only 0
...
As 0
...
0100 mol of MgO will react
...
0496 – 0
...
0396 mol
...
The formula of hydrazine is N2H4 so its molar mass is:
molar mass = (2×14
...
008 (H)) g mol-1 = 32
...
00 × 102 g is therefore:
number of moles (in mol) =
mass(in g)
molar mass(in g mol −1 )
=
1
...
052g mol −1
= 3
...
01 (N) + 4×16
...
02 g mol-1
The number of moles of nitrogen tetraoxide in 2
Title: Chemistry problem solutions
Description: It is a solution for all chemistry problems with solution
Description: It is a solution for all chemistry problems with solution