The compound with the smallest molar mass among the above options is H2O
CALCULATE MOLAR MASS:
- The molar mass of a compound can be calculated by summing up the atomic a masses of its constituent elements.
- The atomic mass of the elements are as follows:
- C = 12g/mol
- O = 16g/mol
- H = 1g/mol
- Na = 23g/mol
Molar mass of CO2 = 12 + 16(2)
= 12 + 32
= 44g/mol
Molar mass of CO = 12 + 16
= 28g/mol
Molar mass of H2O = 1(2) + 16
= 2 + 16
= 18g/mol
Molar mass of NaOH = 23 + 1 + 16
= 40g/mol
- Based on the above calculations, the compound with the smallest molar mass is H2O, which has a molar mass of 18g/mol.
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