Question

Convert into moles :

a)56 grams of Helium atom

b)12.044 × 10²³ atoms of Hydrogen

c)160 grams of Oxygen Gas [O₂]

Answer 1

Hi friend ,

a) Molar mass of helium = 4g
Given mass = 56g

No. of moles = given mass / molar mass
No. of moles = 56g/4g
No. of moles = 14 moles

b) No.of moles = given no. of Atoms / avagadro constant
No. of moles = 12.044 ×10^23/6.022 × 10^23
No. of moles = 2 moles

c) Molar mass of oxygen gas = 16×2 = 32 g
Given mass = 160 g
No. of moles = given mass / molar mass
No. of moles = 5 moles

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Hope this helped u..
PLZ MARK AS BRAINLIEST..

Answer 2

Hi Deepika @_@
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Answer a) 1 mole of Helium =  4 kg 
               [/tex]mole= \frac{given. mass}{molecular .mass} [/tex]
               $[tex] \frac{56}{4} = 14 .moles ______________________________________________________________ Answer b) 1 mole of hydrogen = 1 g = 6.022 x 10²³ atoms                    [tex] \frac{12.044 X10^{23} }{6.022 X 10^23} = 2 . moles$
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Answer c) 1 mole of Oxygen(O2)= 32 gm
                  then in 160 gm of O2 moles are
                  $\frac{160}{32} = 5 .moles$
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                                                                                            - SahilLincoln