Question
The relative atomic mass, Ar, of an element is determined by comparing the mass of one atom of the element with the mass of one atom of element Q.
What is Q?
- carbon
- chlorine
- hydrogen
- oxygen
Answer/Explanation
Ans:
A
Question
Calcium carbonate, \(CaCO_{3}\), reacts with dilute hydrochloric acid to produce carbon dioxide. The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100.
\(CaCO_{3}+2HC\imath \rightarrow CaC\imath _{2}+H_{2}O+CO_{2}\)
10 g of calcium carbonate is reacted with an excess of dilute hydrochloric acid. Which mass of carbon dioxide is produced?
A. 2.2 g B. 2.8 g C. 4.4 g D. 44 g
Answer/Explanation
Ans:
C
Question
A compound has the formula XF2 and has a relative mass of 70.
What is element X?
A gallium
B germanium
C sulfur
D ytterbium
Answer/Explanation
Ans: C
Question
2.56 g of a metal oxide, \(MO_2\), is reduced to 1.92 g of the metal, M.
What is the relative atomic mass of M?
A 48 B 96 C 128 D 192
Answer/Explanation
Ans: B