How many grams of ko2 are needed to form 6.5 g of o2?

The mass of needed is 19.3 grams.

Explanation:

To calculate the number of moles, we use the equation:

     .....(1)

Given mass of oxygen gas = 6.5 g

Molar mass of oxygen gas = 32 g/mol

Putting values in equation 1, we get:

The chemical equation follows:

By Stoichiometry of the reaction:

3 moles of oxygen gas is produced by 4 moles of

So, 0.203 moles of oxygen gas is produced by = of

Now, calculating the mass of by using equation 1, we get:

Molar mass of = 71.1 g/mol

Moles of = 0.271 moles

Putting values in equation 1, we get:

Hence, the mass of needed is 19.3 grams.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

the answer is the first option

explanation:

just googled it m8. not that hard

lol