Home › Tamil Nadu SSLC (Class 10) › Chemistry › Atoms and Molecules › What is the gram molecular mass of carbon dioxid…
What is the gram molecular mass of carbon dioxide, CO2? (Atomic masses: C = 12, O = 16)
A28 g
B32 g
C44 g
D56 g
Answer & Solution
Correct answer: C. 44 g
1. CO2 has one carbon atom and two oxygen atoms.
2. Molecular mass $= (12 \times 1) + (16 \times 2)$.
3. $= 12 + 32 = 44$ g.
Counting only one oxygen gives 28, but CO2 has two oxygen atoms.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 7 Atoms and Molecules "Solved Problems", p.106_
Related questions
Calculate the mass percentage of sulphur in sulphuric acid, H2SO4. (Atomic masses: H = 1, How many atoms of oxygen are present in 5 moles of CO2? (NA = 6.023 x 10^23)Calculate the gram molecular mass of calcium phosphate, Ca3(PO4)2. (Atomic masses: Ca = 40What volume at STP is occupied by 2.5 mole of CO2 gas? (Molar volume = 22.4 litre)How many molecules of water are present in 54 g of H2O? (Molecular mass of H2O = 18, NA = Calculate the number of molecules present in 11.2 litre of CO2 measured at STP. (NA = 6.02Boron occurs as B-10 (20% abundance) and B-11 (80% abundance). Calculate its average atomiAmong the following, which sample has the smallest mass?