Question

5 U mole of a substance is called its molar mass.
xercises
A 0.24 g sample of compound of oxygen and boron was found
by analysis to contain 0.096 g of boron and 0.144 g of oxygen.
Calculate the percentage composition of the compound by
weight
When so g of carbon is burnt in 8.00 g oxygen. 11.00 g of
carbon dioxide is produced. What mass of carbon dioxide will​

Answer 1

Answer:

A) Mass of compound = 0.24 g and, mass of boron = 0.096 g percentage of boron in the compound = mass of boron / mass of compound * 100 = 0.096/0.24 * 100 = 40% mass of oxygen = 0.144 g again, mass of compound = 0.24 g percentage of oxygen in compound = mass of oxygen/mass of of compound * 100 = 0.144/0.24 * 100 = 60% thus ...

Answer 2

11.000

0.096

0.144

8.000

0.240

8.480