3.7 Each of the following balances weighs the indicated numbers of atoms of two elements:

Which element-left, right, or neither,
(a) Has the higher molar mass?
(b) Has more atoms per gram?
(c) Has fewer atoms per gram?
(d) Has more atoms per mole?

The mass of a substance made up of an equal number of fundamental units is defined as a mole.

a)

i) The molar mass of the green (left) material is larger because there are fewer atoms in the same mass (5 green atoms vs. 6 yellow atoms).

ii) The molar mass of the blue (right) substance is larger because there are fewer atoms in the same mass (3 blue atoms vs. 6 red atoms).

iii) The orange (left) material has a higher molar mass since the mass of the same number of atoms is greater.

iv) The molar mass of the grey (left) substance is largerbecause there are fewer atoms in the same mass.

b)

i) The yellow (right) materialcontains more atoms per gram since its molar mass is lower.

ii) The red (left) substance has more atoms per gram than the blue (right)substance because the red substance has a lower molar mass.

iii) The purple (right) materialcontainsmore atoms per gram due to itslower molar mass.

iv) Thered (right) substance has more atoms per gram because themolar massof the red substance is less.

c)

i) Due to its larger molar mass, the grey (left) materialhas fewer atoms per gram.

ii) The blue (right) substancehas fewer atoms per gram because the blue substance's molar mass is greater.

iii) Due to its larger molar mass, the orange (left) materialhas fewer atoms per gram.

iv) Because the blue substance has a higher molar mass, thegrey (left)substance has fewer atoms per gram

d)

Every material has the same amount of atoms per mole, according toAvogadro's constant.