Question

The largest number of molecules is in
(1) 34g of water (2) 28g of CO2
(3) 46g of CH3 OH (4) 54g of N2O5​

Answer 1

Answer:

The largest number of molecules is in 34 g of water is 1.9 × 6.023 x $10^{23}$

Explanation:

Mole:

A mole is the mass of a substance made up of an equal number of fundamental components.

Formula:

Number of moles = $\frac{weight}{molar mass}$  × Avagadro's number

Avogadro’s Number = 6.023 x $10^{23}$

Calculation:

1. Number of molecules in 34g of water

 Chemical formula of water = $H_{2} O$

  Molecular weight of water = 18g

  Number of moles = $\frac{34}{18}$ × 6.023 x $10^{23}$

                               = 1.9 × 6.023 x $10^{23}$

2. Number of molecules in 28g of carbon dioxide

   Chemical formula of water = $CO_{2}$

   Molecular weight of carbon dioxide = 44g

   Number of moles = $\frac{28}{44}$ × 6.023 x $10^{23}$

                               = 0.64  × 6.023 x $10^{23}$

3. Number of molecules in 46 g of carbon dioxide

  Chemical formula of water = $CH_{3}OH$

  Molecular weight of carbon dioxide = 32g

  Number of moles = $\frac{46}{32}$ × 6.023 x $10^{23}$

                               = 1.44  × 6.023 x $10^{23}$

4. Number of molecules in 54 g of carbon dioxide

   Chemical formula of water = $N_{2}O_{5}$

   Molecular weight of carbon dioxide = 108 g

   Number of moles = $\frac{54}{108}$ × 6.023 x $10^{23}$

                                = 0.5  × 6.023 x $10^{23}$

The largest number of molecules is in 34 g of water.

Final answer:

The largest number of molecules is in 34 g of water is 1.9 × 6.023 x $10^{23}$

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Answer 2

Answer:

The largest number of molecules is in $34 g$ of water is$1.9$ × $6.023$x $10^{23}$

Explanation:

Mole:

A mole is the mass of a substance made up of an equal number of fundamental components.

Formula:

Number of moles =   × Avagadro's number

Avogadro’s Number =  $6.023$x $10^{23}$

Calculation:

1. Number of molecules in 34g of water

Chemical formula of water = H2O

 Molecular weight of water = 18g

 Number of moles = 18 g×  $6.023$x $10^{23}$

                              = 1.9 ×  $6.023$x $10^{23}$

2. Number of molecules in 28g of carbon dioxide

  Molecular weight of carbon dioxide = 44g

  Number of moles = 44 ×  $6.023$x $10^{23}$

                              = 0.64  ×  $6.023$x $10^{23}$

3. Number of molecules in 46 g of carbon dioxide

 Molecular weight of carbon dioxide = 32g

 Number of moles =  32×  $6.023$x $10^{23}$

                              = 1.44  × $6.023$x $10^{23}$

4. Number of molecules in 54 g of carbon dioxide

  Molecular weight of carbon dioxide = 108 g

  Number of moles =108  ×  $6.023$x $10^{23}$

                               = 0.5  ×  $6.023$x $10^{23}$

The largest number of molecules is in 34 g of water.

The largest number of molecules is in 34 g of water is 1.9 ×  $6.023$x $10^{23}$

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