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##### 13. Which one of the following pairs has the same mass?(a) 1 mole of \mathrm{CO} and 1 mole of \mathrm{N}_{2} (b) 1 mole of \mathrm{CO} and 1 mole of \mathrm{CO}_{2} (c) 1 mole of \mathrm{O}_{2} and 1 mole of \mathrm{N}_{2} (d) 1 mole of \mathrm{O}_{2} and 1 mole of \mathrm{Co}_{2}

11. How many number of moles are equivalent to 8 grams of \mathrm{Co}_{2} ?(a) 0.15 (b) 0.18 (c) 0.21 (d) 0.24

6 . What will be the mass of 2.05 \times 10^{16} molecules of \mathrm{H}_{2} \mathrm{SO}_{4}

There are 3.01 \times 10^{23} molecules of \mathrm{CO}_{2} present in a container. Calculate the number of moles and its mass.

3. The most abundant element occurring in the oceans is:(a) oxygen(b) hydrogen (c) nitrogen(d) silicon

7 . State three reasons why do you think air is a mixture and water a compound?

Calculate the gram molecule (number of moles) in 40 \mathrm{~g} of \mathrm{H}_{3} \mathrm{PO}_{\alpha} .