The molecular mass of water is ___.
One molecule of water is composed of 2 hydrogen atoms and 1 oxygen atom. Hence its molecular mass = 2 (atomic mass of hydrogen) + Atomic mass of oxygen = 2(1)+16 = 18 u
(a) Calculate the relative molecular mass of water (H2O).
(b) Calculate the molecular mass of HNO3.
Match the following:
1Molecular formula of waterA18 amu2Chemical name of waterBOceans3Molecular mass of waterCH2O4Large water bodiesDDihydrogen monoxide
Correct the following statements:
(a) A molecular formula represents an element.
(b) Molecular formula of water (H2O) represents 9 parts by mass of water.
(c) A balanced equation obeys the law of conservation of mass and so does an unbalanced equation.
(d) A molecule of an element is always monoatomic.
(e) CO and Co both represent cobalt.