Question

You need to measure out .23 mol of C8H16O8 for an experiment. How many grams would you need to weigh out?

Answer 1

55.2497g `C_8` `H_16` `O_8`

Explanation:

`.23mol` `C_8` `H_16` `O_8`

First, let's find the molar mass of `C_8` `H_16` `O_8` by calculating the mass of each element.

Carbon weighs 12.011 grams, and we have 8 of those. Multiply.

`96.088`g Carbon

Hydrogen weighs 1.008 grams, and we have 16 of those. Multiply.

`16.128`g Hydrogen

Oxygen weighs 15.999, or 16g, and we have 8 of those. Multiply.

`128`g Oxygen

Add the atomic masses.

`240.216`g is the molar mass of `C_8` `H_16` `O_8`.

Now, to find the number of grams needed, set up a proportion.

`.23mol` `C_8` `H_16` `O_8` `*` `(240.216/1)`, where 240.216 represents the molar mass of the substance and 1 represents the # of moles. Divide accordingly. Moles on top and bottom cancel out.

Answer: 55.2497g `C_8` `H_16` `O_8`