Question

1. Moles

           

            a. Which has more mass, 1 g of C or 1 g of Pb?

                       

            b. Which has more mass, I mole of C or 1 mole of Pb?

                       

            c. How much mass does a mole of C have, and where do you find this information?

                       

            d. How much mass does a mole of Pb have?

                       

            e. How many atoms does a mole of C have?

                       

            f. How many atoms does a mole of Pb have?

                       

            g. Does a mole of any element have more atoms than a mole of another element?

                       

            h. If a mole of C has the same number of atoms as a mole of Pb, why is a mole of Pb so much heavier than a mole of C?

           

i. How many molecules of CH₄ are in a mole of CH₄?

           

j. What is the mass of a mole of CH₄?

                       

k. How many H atoms are in 1 molecule of CH₄?

                       

l. How many moles of H atoms are in 1 mole of CH₄?

Answer 1

a)
1 g of C and 1 g of Pb has equal mass which is 1 g

b) mol is a unit to measure macroscopic particles
1 mol molecules /atoms has mass equal to its molar/atomic
mass in grams.
so atomic mass of C and Pb will be mass of 1 mol C and Pb

I mole of C has mass= 12.01 g

1 mole of Pb has mass =207.20 g

Hence 1 mol Pb is heavier than C
****************************
c)

1 mol C has mass = atomic mass of C = 12.01 g
From periodic table we get this number

d)

1 mole of Pb has mass =207.20 g

e)

1 mole molecules/atoms contain avogadro number of
molecules/atoms

So 1mol C = 6.022 x10^23 atoms of C

f)
1 mole molecules/atoms contain avogadro number of
molecules/atoms

So 1mol Pb = 6.022 x10^23 atoms of Pb
g)
NO.
1 mole molecules/atoms contain avogadro number of
molecules/atoms
1 mol of any particles will have same number of particles

h)
mol is a unit to measure macroscopic particles
1 mol molecules /atoms has mass equal to its molar/atomic
mass in grams. Since atomic mass of Pb is more than
atomic mass of C, 1 mol Pb is heavier than 1 mole C.

i)

1 mole molecules/atoms contain avogadro number of
molecules/atoms

So 1mol CH4 = 6.022 x10^23 molecules of CH4

J)
1 mol CH4 = molar mass of CH4 = 12.01 + 1.01 *4
= 16.05 g

K)

1 molecule CH4 has 4 atoms of H

L )

1 mol CH4 has 4 mol atoms of H