Test Yourself 3.1:
1. Define relative atomic mass based on the carbon-12 scale.
2. Refer to the Data Table of Elements on page 276 to get the relative atomic masses.
(a) How many atoms of lithium are required to equalise the mass of one atom of krypton?
(b) How many atoms of helium are required to equalise the mass of a silver atom?
3. Calculate the relative molecular mass or the relative formula mass of each of the following substances:
(a) Methane, CH4
(b) Magnesium nitrate, Mg(NO3)2
(c) Sulphuric acid, H2SO4
(d) Formic acid, HCOOH
Answer:
1. Relative atomic mass is the average mass of one atom of an element compared to 1/12 mass of one atom of carbon-12
2. (a) 12 lithium atoms
(b) 27 helium atoms
3. (a) 16
(b) 148
(c) 98
(d) 46
1. Define relative atomic mass based on the carbon-12 scale.
2. Refer to the Data Table of Elements on page 276 to get the relative atomic masses.
(a) How many atoms of lithium are required to equalise the mass of one atom of krypton?
(b) How many atoms of helium are required to equalise the mass of a silver atom?
3. Calculate the relative molecular mass or the relative formula mass of each of the following substances:
(a) Methane, CH4
(b) Magnesium nitrate, Mg(NO3)2
(c) Sulphuric acid, H2SO4
(d) Formic acid, HCOOH
Answer:
1. Relative atomic mass is the average mass of one atom of an element compared to 1/12 mass of one atom of carbon-12
2. (a) 12 lithium atoms
(b) 27 helium atoms
3. (a) 16
(b) 148
(c) 98
(d) 46