formula: 2KClO3 + NaCL = 2KCl + NaCl + 3O2
MASS OF TEST TUBE & MIXTURE = 34.03 G
MASS OF EMPTY TEST TUBE = 31.29 G
MASS OF MIXTURE = 2.74 G
1ST WEIGHT OF TEST TUBE & RESIDUE =33.64 G
FINAL WEIGTH OF TEST TUBE & RESIDUE = 33.64 G
MASS OF RESIDUE = 2.35 G
MASS OF OXYGEN = 0.39
MOLES OF OXYGEN = ???
MOLES OF KCLO3 = ???
MASS OF KCLO3 = ???
MASS OF NACLL(#3-#10) = ????
MOLE OF NACL = ?????
MASS PERCENT OF KCLO3 = ????
What trouble are you having?
To solve the given questions, we will use the stoichiometry of the balanced equation provided.
Given:
- Mass of test tube and mixture = 34.03 g
- Mass of empty test tube = 31.29 g
- Mass of mixture = 2.74 g
- 1st weight of test tube & residue = 33.64 g
- Final weight of test tube & residue = 33.64 g
- Mass of residue = 2.35 g
- Mass of oxygen = 0.39 g
1. Moles of Oxygen:
To find the moles of oxygen (O2), we need to use its molar mass. The molar mass of oxygen is 32 g/mol.
Moles of oxygen (O2) = Mass of oxygen / Molar mass of oxygen
Moles of oxygen = 0.39 g / 32 g/mol = 0.0122 mol (rounded to four decimal places)
2. Moles of KClO3:
According to the balanced equation, for every 3 moles of oxygen produced, we have 2 moles of KClO3 reacting.
Moles of KClO3 = (Moles of oxygen) * (2 moles of KClO3 / 3 moles of O2)
Moles of KClO3 = 0.0122 mol * (2/3) ≈ 0.00813 mol (rounded to five decimal places)
3. Mass of KClO3:
To find the mass of KClO3, we can use the molar mass of KClO3, which is 122.55 g/mol.
Mass of KClO3 = Moles of KClO3 * Molar mass of KClO3
Mass of KClO3 = 0.00813 mol * 122.55 g/mol ≈ 0.996 g (rounded to three decimal places)
4. Mass of NaCl (#3-#10):
The mass of NaCl can be calculated by subtracting the mass of KClO3 and residue from the mass of the mixture.
Mass of NaCl = Mass of mixture - Mass of KClO3 - Mass of residue
Mass of NaCl = 2.74 g - 0.996 g - 2.35 g ≈ -0.606 g (rounded to three decimal places)
(Note: The negative value suggests an error or inconsistency in the given data. Please check your calculations or confirm the information provided.)
5. Moles of NaCl:
To find the moles of NaCl, we need to use the molar mass of NaCl, which is 58.44 g/mol.
Moles of NaCl = Mass of NaCl / Molar mass of NaCl
Moles of NaCl = (-0.606 g) / 58.44 g/mol ≈ -0.0104 mol (rounded to four decimal places)
(Note: The negative value suggests an error or inconsistency in the given data. Please check your calculations or confirm the information provided.)
6. Mass Percent of KClO3:
The mass percent of KClO3 is the ratio of the mass of KClO3 to the total mass of the mixture, multiplied by 100.
Mass Percent of KClO3 = (Mass of KClO3 / Mass of Mixture) * 100
Mass Percent of KClO3 = (0.996 g / 2.74 g) * 100 ≈ 36.38% (rounded to two decimal places)