Mole Concept And Molar Masses

Mole of sucrose

Formula of sucrose
Number of atoms in one mole of sucrose
Number of atoms in of sucrose

Molecular weight of
Moles of

Number of atoms in of
No. of moles

The number of molecules is related to the number of moles of a substance. To compare the number of molecules in each option, we calculate the moles of each substance based on their molar masses. The substance with the least molar mass (hydrogen in this case) will have the most molecules for the given mass.

Step 2: Conclusion.
The correct answer is , corresponding to option (c).

Given: The mass of water is 18 g. Step 1: Molar Mass of Water The molar mass of water ( ) is calculated as: Step 2: Calculate the Number of Moles The number of moles is given by: Answer: The correct answer is option (1): 1 mol.

Given: NaCl is composed of one sodium atom (Na) and one chlorine atom (Cl). Step 1: Atomic masses of sodium and chlorine From the periodic table: - The atomic mass of sodium (Na) is approximately , - The atomic mass of chlorine (Cl) is approximately . Step 2: Calculate the molar mass of NaCl The molar mass of NaCl is the sum of the atomic masses of sodium and chlorine: Answer: The correct answer is option (1): 58 g/mol.