STOICHIOMETRY
What is stoichiometry?
Stoichiometry is the basic chemical calculation that
states quantitative relation of chemical formula and chemical equations. With stoichiometry
you can calculate for examples; the mass, the mol, the volume, the percent,
themperature, amount of molecul, amount of atom and another of thing.
Examples:
2,3 gram Natrium
(Ar:23) included in 0.5 liter of HCl 0.1 M.
Question :
1. what is the chemical
equations will be happen ?
2. how much mass of
Natrium remainded ?
3. how much mass of
NaCl produce ?
4. How much volume H2
in
STP ?
Answers:
1. what is the chemical
equations will be happen ?
2Na + 2HCl -----à
2 NaCl + H2
2. how much mass of
Natrium remainded ?
3. how much mass of
NaCl produce ?
4. How much volume H2
in
STP ?
The moll of natrium
reacted :
Mol Na = mass / Mr Mol
HCl = Volume x concentrate
= 2,3 grm / 23 = 0.1 liter x 0.5 M
= 0.1 mol = 0.05 mol
2Na + 2HCl -----à 2 NaCl + H2
M 0,1 mol 0,05
mol - -
R 2/2 x 0,05 mol 0,05 mol 0,05
mol
½ x 0,05 mol
S 0,05 mol - 0,05 mol 0,025
mol
2. how much mass of
Natrium remainded ?
The mass Na reacted is The mass of Natrium remainded is
Mass = mol x Mr 2,3 grams – 1,15
grams = 1,15 grams
= 0,05 mol x 23
=
1,15 grams
3. how much mass of
NaCl produce ? 4. how
much volume H2 in STP ?
Mass
= moll x Mr volume (STP) = moll x 22,4
=
0,05 mol x 58,5 = 0,025 mol x 22,4
=
2,925 grams = 0,56 liter
For the video lets check this link :
https://youtu.be/bq7_KHgwma8
https://youtu.be/bq7_KHgwma8
Can you explain why the mole reacts as much as 0.05
BalasHapusWhy the number of moles that reacts is only 0.05 mol because we know that the solution is basically exhausted because the mole of HCl is 0.05mol so that through the coefficient ratio of the reaction it was found that only 0.05 mol of Na reacted
HapusOn your reaction equation, what is the number of molecules in the NaCl compound?
BalasHapusThe number of molecul in NaCl
HapusThe mol x 6.022 x 10^23
0.05 x 6.022 x 10^23
0.3011 x 10^23
3011 x 10^19 molecul
For example in the combustion of FeS2 (Mr = 120) produced 2.24 liters of SO2 gas (STP) according to the reaction: FeS2 (s) + O2 (g) → Fe2O3 (s) + SO2 (g)
BalasHapusHow do we determine the required FeS2 mass
How many way to calculate mol and please explain about it
BalasHapusFor example by the way
Hapus1. the relationship of mol substances with the mass of matter
Mass = mole x Mr
2. through relationship with gas volume
How to calculate a remain from one elements in your reaction?
BalasHapusHow to calculate how much the remaining substance tentunyankita must know in advance how number of mul react. In general the solution will react entirely so that we can do a coefficient comparison to find out how many moles it reacts.
HapusOf the reacting mole we can determine how much the mass reacts. From there we can calculate the remaining through the initial mass less the reacting mass.
Is there a relationship between the rest of the reaction with stoichiometric calculation?please explain to me!
BalasHapuscan you explain about Consider the following reaction equation!
BalasHapusMg + 2HCl → MgCl2 + H2
When 4 grams of Mg metal is introduced into 10 mL 2 M HCl solution, then the volume of H2 gas formed under standard circumstances is ...
(Ar Mg = 24; H = 1; Cl = 35.5)
When 4 grams of Mg metal is introduced into 10 mL 2 M HCl solution, then the volume of H2 gas formed under standard circumstances is ...
(Ar Mg = 24; H = 1; Cl = 35.5)