Question

What’s is the mass in grams of 5.90 mol C8H18?

Answer 1

Mass = 5.90 x 114 = 672.6g.

This can be rounded to 673g

C = 12 grams x 8 = 96 grams  

H = 1 gram x 18 = 18 grams  

Total = 96 + 18 = 114 grams in one mole.  

If you have 5.9 moles, multiply this by the weight of one mole (114 grams) = 672.6 rounded to 673 grams in 5.9 moles.

Answer 2

The mass of 5.90 moles of  $\rm C_8H_1_8$ has been 672.6 grams.

To calculate the mass of 5.90 moles of the $\rm C_8H_1_8$, the molecular mass of the molecule has to be calculated. The molecular mass has been the sum of the mass of the atoms present in the molecule.

A molecule of $\rm C_8H_1_8$ has been consisted of 8 atoms of Carbon, and 18 atoms of hydrogen.

The molecular weight of $\rm C_8H_1_8$ = 8 $\times$ molecular mass of Carbon + 18 $\times$ molecular mass of Hydrogen

The molecular weight of $\rm C_8H_1_8$ = (8 $\times$ 12) + (18 $\times$ 1)

The molecular weight of $\rm C_8H_1_8$ = 114 g/mole.

mass = mole $\times$ molecular weight

Mass of 5.90 moles of $\rm C_8H_1_8$ = 5.90 $\times$ 114 grams

Mass of 5.90 moles of $\rm C_8H_1_8$ = 672.6 grams.

The mass of 5.90 moles of  $\rm C_8H_1_8$ has been 672.6 grams.

For more information about the mass of a molecule, refer to the link:

https://brainly.com/question/18838161