# chemistry

posted by .

A 2.45 gram sample of potassium chlorate is heated an the oxygen gas collected. what is the volume of the oxygen at STP.

Is the oxygen gas itself 2.45 grams or do I have to subtract something from that?

• chemistry -

No, the KClO3 from which the oxygen is evolved, has a mass of 2.45 g. You need to write the equation, balance it, convert 2.45 g KClO3 to mols, convert mols KClO3 to mols O2 using the coefficients in the balanced equation, then convert mols O2 to liters knowing that 22.4 L is the volume occupied by a mole of a gas at STP. USUALLY, oxygen is collected over water and that must be corrected for the vapor pressure of water; however, your problem doesn't say anything about water; therefore, I asume we don't need to worry about that.Post your work if you get stuck and we can help you through it.

• chemistry -

what reactants would there be besides O2?

• chemistry -

Heating KClO3 produces oxygen and potassium chloride.
KClO3 + heat ==> KCl + O2
The balanced equation is:
2KClO3 ==> 2KCl + 3O2.

## Similar Questions

1. ### chem

At hihg temperatures Sodium chlorate decomposes to form Sodium Chloride and Oxygen gas. A 0.8765 gram sample of sodium chlorate was heated until the reaction ended when Oxygen gas production was ceased. The Oxygen gas collected over …
2. ### science: chemistry

When a sample of potassium nitrate is heated, oxygen gas is produced. This gas, collected in a 750 milliliter flask, has a pressure of 2.8 atmosphere and the temperature is recorded to be 53.6°C. How many moles of oxygen gas are produced …
3. ### chemistry

The decomposition of potassium chlorate, KClO3, gives oxygen gas and solid potassium chloride. How many grams of KClO3 are needed to produce 5.00 L of Oxygen gas at STP?
4. ### chemistry

potassium chlorate will decompose to produce potassium chloride and oxygen gas . if you begin with 45 kg of potassium chlorate, how many liters of oxygen gas measured at stp might you expect to produce from this reaction
5. ### chemistry

At elevated temperatures, sodium chlorate decomposes to produce sodium chloride and oxygen gas. A 0.8915-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen gas collected over water occupied …
6. ### Chemistry

When a sample of potassium nitrate is heated, oxygen gas is produced. This gas, collected in a 750 milliliter flask, has a pressure of 2.8 atmosphere and the temperature is recorded to be 53.6°C. How many moles of oxygen gas are produced …
7. ### chemistry

can anyone help with this problem please..... Potassium chlorate decomposes according to the following equation: 2KClO3 (s) → 2KCl (s) + 3O2 (g). If a 3.00 g sample of KClO3 is decomposed and the oxygen is collected at 24.0 °C …
8. ### chemistry

What volume of a oxygen at STP was collected?
9. ### Chemistry

At STP potassium chlorate (KClO3) decomposes to produce solid potassium chloride (KCL) and oxygen gas (O2) according to the balanced chemical equation: 2KClO3(s)->2KCl(s)+3O2(g) What volume of oxygen gas, measured at 40 degrees …
10. ### Chemistry

A 26.3 gram sample of solid potassium chlorate decomposed and produced 9.45 grams of oxygen gas. What is the percent yield of oxygen?

More Similar Questions

Post a New Question