Question

Potassium Phthalate, KC8H604, is a main source of whistle fuel for many fireworks. A standard firework had 25g of potassium phthalate.​ Calculate the following:

The molar mass of the compound.
How many molecules of fuel there are
The number of moles of Carbon

Answer 1

Step-by-step explanation:

The given compound is:

KC₈H₆O₄

Mass of the compound = 25g

Molar mass of the compound

KC₈H₆O₄

Atomic mass of K = 39

C = 12

H = 1

O = 16

Molar mass of the compound = 39 + 8(12) + 6 (1) + 4(16)

= 205g/mol

Number of molecules of fuel there in:

Find the number of moles then convert this to number of molecules;

Number of moles =
`(mass)/(molar mass)`

Number of moles =
`(25)/(205)` = 0.12mol

1 mole of a compound contains 6.02 x 10²³ molecules

0.12 mole of the phthalate will contain 0.12 x 6.02 x 10²³ =

7.34 x 10²²molecules

Number of moles of Carbon

1 mole of the phthalate contains 8 mole of carbon

0.12 mole of the phthalate will contain 0.12 x 8 = 0.96mole of carbon