Question

which of the following has maximum number of atom first 18 gram of water (2)
18 gram of oxygen (3) 18 gram of carbon dioxide (4) 18 gram of methane
​

Answer 1

Answer:

$(4) \: 18 \: gram \: of \: methane$

$is \: your \: right \: answer$

$100\%sure$

Answer 2

Here's your answer :)

Lets check one by one...

( 1 ) 18g of water

• Chemical Formula of water = H2O
• Molar mass of H2O = 18g

♡ 1 mole of atoms / molecules is equal to number of atoms/molecules which has mass equals to Gram atomic mass or gram molecular mass ♡

So

18g of H2O will contain Avogadro's number

( 6.022 × 10²³ ) of molecules

18g H2O contains 6.022 × 10²³ H2O molecules

☆ Since 1 H2O molecule has 2 Hydrogen atoms so 6.022 × 10²³ will have 2 ×6.022 × 10²³ no. of Hydrogen atoms

☆ Since 1 H2O molecule has 1 oxygen atom so 6.022 × 10²³ molecules will have 1 × 6.022 × 10²³ no. of oxygen atoms

_______CONCLUSION______

18g of H2O or water has 6.022 × 10²³ oxygen atoms and 12.044 × 10²³ Hydrogen atoms

Total number of atoms in 18g of H2O is equal to

10²³ ( 6.022 + 12.044 ) = 18.066 × 10²³ atoms

____________________________________

( 2 ) 18g of Oxygen

• Atomic mass of Oxygen = 16g

• 16g of Oxygen will contain 6.022 × 10²³ number of atoms

• 1g of Oxygen will contain 6.022 × 10²³ ÷ 16 number of atoms

• 18g of Oxygen will contain ( 6.022 × 10²³ ÷ 16 ) × 18 6.77475 × 10²³ number of oxygen atoms

_______CONCLUSION_____

18g of Oxygen contains 6.77475 × 10²³ number of atoms

__________________________________

( 3 ) 18g of Carbon dioxide

• Molar mass of CO2 = 44g

• 44g of CO2 contains 6.022 × 10²³ number of Co2 molecules

• 18g of CO2 will contain ( 6.022 × 10²³ ÷ 44 ) × 18 = 2.46254 × 10²³ number of molecules

• Number of carbon atoms in 2.46254 × 10²³ Co2 molecules = 1 × 2.46254 × 10²³ atoms

• Number of oxygen atoms in that much Co2 molecules

= 2 x 2.46254 × 10²³ atoms

_______CONCLUSION____

Number of atoms in 18g of CO2 = ( 2.46254 + 4.92708 ) x 10²³ atoms

=》 7.38962 × 10²³ atoms

______________________________

( 4 ) 18g of methane

• Molar mass of CH4 = 16g

• Number of molecules in 18g of CH4 is ( 6.022 × 10²³ ÷ 16 ) x 18 = 6.77475 × 10²³

•Number of carbon atoms = 6.77475 × 10²³

•Number of Hydrogen atoms = 4 × no. of molecules = 27.099 × 10²³

________CONCLUSION______

Number of atoms in 18g of Methane = (6.77475 + 27.099) x 10²³

=》 33.87375 × 10²³ atoms

______________________________

On comparing different conclusions

18g of methane contains more atoms ☆

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