Question

The weight of 2.01x10^23 molecule of Co is

Answer 1

Explanation:

1 mole of CO=6.022×1023 molecules

X moles of CO=2.01×1023 molecules 

Therefore X=6.022×1023x2.01×1023

9.34g

                    =0.3337 moles

1 mole of CO weighs 28 g 0.3337

mole weighs in g=  28×0.3337

                =9.34 g

Hence the correct option is A.

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Answer 2

Answer:

the weight of CO = 9.33 g

Explanation:

Molecular weight of CO = 12+ 16 =28

one mole of CO contains 6.02× 10^23 molecules

So 6.02× 10^23 molecules weigh = 28 g

hence 2.03×10^23 molecules weigh

28× 2.03×10^23 28

= ------------------------- = ----

6.02×10^23 3

hence the weight of CO = 9.33 g