RELATIVE ATOMIC MASS AND RELATIVE MOLECULAR MASS

A

100

The relative atomic mass of copper and oxygen are 64 and 16 respectively. How many times is copper heavier than an oxygen atom? 

4

200

Calculate the relative mass of Al₂O₃.

[Relative mass: H=1; C=12; N=14; O=16; Al=27; Ca=40; Cu=64; Br=80]

102

300

The relative formula mass of XF6 is 300. Find the relative atomic mass of X and predict the element of X.

[Relative mass: F=19]

Relative atomic mass = 186

Element X = Rhenium.

B

100

How many atoms of nitrogen have the same mass as one atom of iron?

[Relative mass: N-14, Fe-56]

4

200

Calculate the relative mass of CaCO₃.

[Relative mass: H=1; C=12; N=14; O=16; Al=27; Ca=40; Cu=64; Br=80]

100

300

Determine the percentage of silver by mass in silver carbonate.

[Relative mass: C=12; O=16; Ag=108]

78.26%

C

100

A silver atom is 4 times heavier than an atom X. If the relative atomic mass of silver is 108, what is the relative atomic mass of X? 

27

200

Calculate the relative mass of (NH₄)₂CO₃.

[Relative mass: H=1; C=12; N=14; O=16; Al=27; Ca=40; Cu=64; Br=80]

96

300

The relative atomic mass of boron is 10.81, which is derived from 80% of Boron-11 and 20% of Boron-Y. Determine the nucleon number of Boron-Y.

10