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Artemon [7]
3 years ago
14

How many molecules are in 12 grams of methane (CH 4 )?

Chemistry
2 answers:
Sveta_85 [38]3 years ago
8 0

To calculate number of molecules, we first need to calculate the number of moles of methane.

Number of moles of methane = \frac{Given mass}{Molar mass of methane}

Molar mass of methane= 16.04 g/mol

Given mass of methane= 12 g

Number of moles of methane=\frac{Given mass}{Molar mass of methane}

=\frac{12}{16.04}

= 0.74 mol

Number of molecules of methane = 0.74\times 6.023 \times 10^{23}

= 4.5 × e²³


levacccp [35]3 years ago
7 0
12 grams of methane is one mole. So there are N(Avogadro)=6.22 x 10^23 molecules in one mole of methane
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3 years ago
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Answer:

THE EMPIRICAL FORMULA OF THE SUBSTANCE IS C2H5NO

Explanation:

The steps involved in calculating the empirical formula of this substance in shown in the table below:

Element                            Carbon           Hydrogen          Nitrogen         Oxygen

1. % Composition              40.66              8.53                 23.72                27.09

2. Mole ratio =

%mass/ atomic mass       40.66/12         8.53/1          23.72/14            27.09/16

                                       =  3.3883            8.53              1,6943             1.6931

3. Divide by smallest

value (0.6931)          3.3883/1.6931    8.53/1.6931    1.6943/1.6931   1.6931/1.6931

                               =      2.001                  5.038           1.0007                      1

4. Whole number ratio        2                       5                   1                               1

The empirical formula = C2H5NO

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