# Chemistry

posted by .

If 237 mL of O2, measured at STP, are obtained by the decomposition of the KClO3 in a 5.44 g mixture of KCl and KClO3,
2KClO3(s)-->2KCl(s)+3O2(g)
what is the percent by mass of KClO3 in the mixture?

• Chemistry -

%KClO3 = (mass KClO3/mass sample) x 100 = ??
mass KClO3 = what?
0.237 g O2 x (1 mole O2/22.4L O2) x (2 moles KClO3/3 moles O2) x (122.6 g KClO3/mole KClO) = grams KClO3.

• Chemistry -

mass percent of oxygen in potassium chlorate:

## Similar Questions

1. ### Chemistry

Can you show me how to do this? 2KClO3 -> 2KCl + 3O2 If 5.0(g) of KClO3 is decomposed , what volume of O2 is produced at STP?
2. ### chemistry

I just can't do this... Two moles of potassium chloride and three moles of oxygen are produced from the decomposition of two moles of potassium chorate. What is the balanced equation?
3. ### Chemistry

2KClO3 --> 2KCl + 3O2 What mass of O2 can be made from heating 125 g of KClO3?
4. ### chemistry

If 267 mL of O2, measured at STP, are obtained by the decomposition of the KClO3 in a 3.33 g mixture of KCl and KClO3, 2KClO3(s) --> 2KCl(s) + 3O2 What is the percent by mass of KClO3 in the mixture?
5. ### chemistry

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 …

Oxygen gas can be generated by heating KClO3 in the presence of some MnO2. 2KClO3 → 2KCl + 3O2 If all the KClO3 in a mixture containing 1.00 g KClO3 and 0.25 g MnO2 is decomposed, how many liters of O2 gas will be generated at …
7. ### Chemistry

Oxygen gas can be generated by heating KClO3 in the presence of some MnO2. 2KClO3 → 2KCl + 3O2 If all the KClO3 in a mixture containing 1.58 g KClO3 and 0.30 g MnO2 is decomposed, how many liters of O2 gas will be generated at …
8. ### Chemistry

Consider the thermal decomposition of potassium chlorate. 2 KClO3 (s)-----> 2 KCl (s) + 3 O2 (g) A mixture containing KCl and KClO3 weighing 1.80 g was heated producing 1.40 x 102 mL of O2 gas at STP. What percent of the original …
9. ### CHEMISTRY

Oxygen gas can be generated by heating KClO3 in the presence of some MnO2. 2KClO3 → 2KCl + 3O2 If all the KClO3 in a mixture containing 1.64 g KClO3 and 0.20 g MnO2 is decomposed, how many liters of O2 gas will be generated at …
10. ### Chemistry

Consider the thermal decomposition of potassium chlorate. 2 KClO3(s) ---> 2 KCl(s) + 3 O2(g) A mixture containing KCl and KClO3 weighing 1.80 g was heated producing 1.40 x 102 mL of O2 gas at STP. What percent of the original mixture …

More Similar Questions