I'm doing a lab in chemistry and I need help with a question, here is my data:

Mass Before: 26.4 g
After burned: 26.25 g
Total Mass burned: .15 g

1. Calculate the mass of oxygen that was consumed while the candle burned.

I think I need to use mole equations and that kind of stuff but I just don't know how to set up the equation, please help.

To calculate the mass of oxygen consumed during burning, you can use the concept of conservation of mass. In this reaction, the candle is burning, consuming oxygen and releasing carbon dioxide and water vapor.

The balanced chemical equation for the combustion of candle wax is:

C25H52 (candle wax) + 38 O2 → 25 CO2 + 26 H2O

To find the mass of oxygen consumed, you need to know the molar masses of the compounds involved. The molar mass of O2 is 32 g/mol.

Step 1: Calculate the number of moles of candle wax burned:
Mass of candle wax burned = Mass before - Mass after
= 26.4 g - 26.25 g
= 0.15 g

Molar mass of candle wax (C25H52) = 25*(12.01 g/mol) + 52*(1.01 g/mol)
= 314.77 g/mol

Number of moles of candle wax burned = Mass of candle wax burned / Molar mass of candle wax
= 0.15 g / 314.77 g/mol

Step 2: Use the balanced equation to find the moles of oxygen consumed. According to the balanced equation, the mole ratio between C25H52 and O2 is 1:38.

Number of moles of O2 consumed = Number of moles of candle wax * (38 moles O2 / 1 mole candle wax)

Step 3: Calculate the mass of oxygen consumed by multiplying the number of moles of oxygen consumed by the molar mass of O2.

Mass of oxygen consumed = Number of moles of O2 consumed * Molar mass of O2

Now, you can plug in the numbers and calculate the mass of oxygen consumed.

To calculate the mass of oxygen consumed during the burning of the candle, you can use the concept of stoichiometry. The balanced chemical equation for the combustion of a candle can be represented as follows:

C(s) + O2(g) → CO2(g)

In this equation, C represents the carbon in the candle, O2 represents the oxygen from the atmosphere, and CO2 represents the resulting carbon dioxide.

To determine the mass of oxygen consumed, you need to find the difference in mass before and after burning the candle, which is the total mass burned. In this case, it is 0.15 g.

First, calculate the moles of carbon burned by subtracting the mass after burning from the mass before burning:

Moles of carbon = (Mass Before - Mass After) / Molar Mass of Carbon

The molar mass of carbon is approximately 12.01 g/mol.

Next, you need to use the balanced chemical equation to determine the stoichiometric ratio between carbon and oxygen. From the equation, you can see that one mole of carbon burns with one mole of oxygen, so the ratio is 1:1.

Since the moles of oxygen consumed will be the same as the moles of carbon, you can calculate the moles of oxygen consumed.

Moles of oxygen = Moles of carbon

Finally, calculate the mass of oxygen consumed using the moles of oxygen and the molar mass of oxygen:

Mass of oxygen = Moles of oxygen × Molar Mass of Oxygen

The molar mass of oxygen is approximately 16.00 g/mol.

By following these steps and plugging in the appropriate values, you should be able to calculate the mass of oxygen that was consumed while the candle burned.