5 मोल जल का द्रव्यमान होगा

Options

A. 18gm
B. 18 U
C. 90 gm
D. 90 U

Answer

To find the mass of 5 moles of water (H₂O), we can follow these steps:

### Step 1: Determine the molar mass of water (H₂O)
Water is composed of 2 hydrogen atoms and 1 oxygen atom. The molar mass can be calculated as follows:
- Molar mass of Hydrogen (H) = 1 g/mol
- Molar mass of Oxygen (O) = 16 g/mol

So, the molar mass of water (H₂O) is:
\[ \text{Molar mass of H₂O} = (2 \times 1) + (1 \times 16) = 2 + 16 = 18 \text{ g/mol} \]

### Step 2: Calculate the mass of 5 moles of water
Now that we know the molar mass of water is 18 g/mol, we can find the mass of 5 moles:
\[ \text{Mass of 5 moles of water} = \text{Number of moles} \times \text{Molar mass} \]
\[ \text{Mass} = 5 \text{ moles} \times 18 \text{ g/mol} = 90 \text{ grams} \]

### Final Answer
The mass of 5 moles of water is 90 grams.

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