Question

Which of the following does 360 g of water contain?

i 2 moles of H2O

ii 20 moles of H2O

iii 6.022
Options


i

ii and iv

ii and iii

i and iv​

Answer 1

Answer:

i) 2 moles of water:

1 mole of water= molecular weight of water= 18 g of water

2 moles of water = 18×2=36 g of water.

ii) 20 moles of water:

1 mole of water= mol.wt of water= 18 g of water

20 moles of water=18×20=360 g of water

iii) 6.02×10

23

molecules of water= mol.wt of water=18 g of water

iv) 6.02×10

23

molecules of water= mol.wt of water=18 g of water

1.2044×10

25

molecules of water=

6.02×10

23

1.2044×10

25

moles of water = 20 moles of water = 360 g of water.

Therefore option D (ii and iv) is correct.

Answer 2

Answer:

Your Answer is : option B

Explanation:

• mole of water = molar mass of water =18g 20 moles of water = 18 g x 20 = 360g .
• From point, 6.022 x 1023 molecules of water = 1 mole = 18g of water 1.2044 x 1025 molecules of water

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