Relative Atomic Mass and Relative Molecular Mass

Chemistry ⇒ Atomic Structure and the Periodic Table

Relative Atomic Mass and Relative Molecular Mass starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Relative Atomic Mass and Relative Molecular Mass. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

A molecule of methane (CH₄) contains one carbon atom and four hydrogen atoms. If C = 12.0 and H = 1.0, what is the relative molecular mass of methane?

A molecule of nitrogen gas (N₂) contains two nitrogen atoms. If the relative atomic mass of nitrogen is 14.0, what is the relative molecular mass of N₂?

A sample of chlorine contains 75% Cl-35 and 25% Cl-37. What is the relative atomic mass of chlorine?

A sample of element X contains 75% isotope X-35 (mass = 35) and 25% isotope X-37 (mass = 37). Calculate the relative atomic mass of X.

A sample of element Y contains 60% Y-64 (mass = 64) and 40% Y-66 (mass = 66). Calculate the relative atomic mass of Y.

Calculate the relative molecular mass (Mr) of H₂SO₄. (Given: H = 1.0, S = 32.1, O = 16.0)

Calculate the relative molecular mass of Al₂(SO₄)₃. (Al = 27.0, S = 32.1, O = 16.0)

Calculate the relative molecular mass of C₆H₁₂O₆. (C = 12.0, H = 1.0, O = 16.0)

Calculate the relative molecular mass of CaCO₃. (Ca = 40.1, C = 12.0, O = 16.0)

Calculate the relative molecular mass of CO₂. (C = 12.0, O = 16.0)

Calculate the relative molecular mass of HNO₃. (H = 1.0, N = 14.0, O = 16.0)

Calculate the relative molecular mass of NaCl. (Na = 23.0, Cl = 35.5)

Describe how mass spectrometry can be used to determine the relative atomic mass of an element.

Describe the main difference between relative molecular mass and relative formula mass.

Explain the difference between relative atomic mass and mass number.

Explain why the relative atomic mass of an element may change if the isotopic composition of the element changes.

Explain why the relative atomic mass of hydrogen is not exactly 1.

If the relative atomic mass of magnesium is 24.3, what does this value represent?

The relative atomic mass of boron is 10.8. Explain why this value is not a whole number.

The relative atomic mass of lithium is 6.94. If lithium has two isotopes, Li-6 (7.5%) and Li-7 (92.5%), calculate the relative atomic mass to two decimal places.