Question

Which have maximum number of atoms??:
(a) 40 g of SO3
(b) 17 g of ammonia
(c) 18 g of water
(d) 16 g of methane
Please reply faster as possible. ........

Answer 1

a) Molar mass of SO3 = 32 + 16×3 = 80g

number of moles of SO3 = 40/ 80 = 0.5 moles

Number of atoms in 1 SO3 molecule = 4

Number of moles of atoms in 40g SO3 = 0.5 × 4 = 2 moles
__________________

b)Molar mass of ammonia(NH3 )= 14 + 1×3 = 17g

number of moles of NH3 = 17/17 = 1 mole

Number of atoms in 1 NH3 molecule = 4

Number of moles of atoms in 17g of NH3= 1 × 4 = 4 moles
_____________________

c)Molar mass of water(H2O) = 1×2 + 16 = 18g

number of moles of H2O = 18/18 = 1 mole

Number of atoms in 1 H2O molecule = 3

Number of moles of atoms in 18g H2O = 1 × 3 = 3 moles
_____________________

d)Molar mass of methane(CH4)= 12 + 1×4 = 16g

number of moles of CH4 = 16/16 = 1 mole

Number of atoms in 1 CH4 molecule = 5

Number of moles of atoms in 16g of CH4= 1 × 5 = 5 moles
_____________________

You can see that 16g of methane has 5 moles of atoms in it which is the maximum among all the options given.

Your answer is D.

Answer 2

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a) Molar mass of SO3 = 32 + 16×3 = 80g

number of moles of SO3 = 40/ 80 = 0.5 moles

Number of atoms in 1 SO3 molecule = 4

Number of moles of atoms in 40g SO3 = 0.5 × 4 = 2 moles

__________________

b)Molar mass of ammonia(NH3 )= 14 + 1×3 = 17g

number of moles of NH3 = 17/17 = 1 mole

Number of atoms in 1 NH3 molecule = 4

Number of moles of atoms in 17g of NH3= 1 × 4 = 4 moles

_____________________

c)Molar mass of water(H2O) = 1×2 + 16 = 18g

number of moles of H2O = 18/18 = 1 mole

Number of atoms in 1 H2O molecule = 3

Number of moles of atoms in 18g H2O = 1 × 3 = 3 moles

_____________________

d)Molar mass of methane(CH4)= 12 + 1×4 = 16g

number of moles of CH4 = 16/16 = 1 mole

Number of atoms in 1 CH4 molecule = 5

Number of moles of atoms in 16g of CH4= 1 × 5 = 5 moles

_____________________

You can see that 16g of methane has 5 moles of atoms in it which is the maximum among all the options given.

Your answer is D.