Question

Number of moles in 180 grams water is:

Hint:

Number of moles = Mass of substance / Molar mass. Always check the molar mass of the compound before solving.

Answer 1

Step 1: Formula for number of moles.
The number of moles is given by: \[ \text{Number of moles} = \frac{\text{Given mass}}{\text{Molar mass}} \]
Step 2: Substituting values.
The molar mass of water \( H_2O \) is: \[ M = 2 \times 1 + 16 = 18 \, \text{g/mol} \] The given mass of water is \( 180 \, \text{g} \). \[ \text{Number of moles} = \frac{180}{18} = 10 \]
Step 3: Correct option.
Thus, the number of moles in 180 g of water is 10.
Final Answer: \[ \boxed{10} \]