as a candle burns, the size of the candle decreases, but the reading on the balance does not change. how would reading the scale change as the candle burns if the candle was not in a closed system​

I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wpazsebu

how many grams of oxygen are there in 79 moles of oxygen?

1264g

Explanation:

Given parameters:

Number of moles of oxygen = 79moles

Unknown:

Mass in grams of oxygen  = ?

Solution:

To find the mass, we simply use the expression below;

          Mass of Oxygen  = number of moles x molar mass

Molar mass of Oxygen  = 16g/mol

  Insert the parameters and solve;

         Mass of Oxygen  = 79 x 16  = 1264g