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Deffense [45]
3 years ago
6

8. Determine the molecular formula of the following compound: 40.3% B, 52.2% N.

Chemistry
1 answer:
Svetach [21]3 years ago
5 0

Answer:

Molecular formula = B₃N₃H ₆

Explanation:

Given data:

Percentage of B = 40.3%

Percentage of N = 52.2%

Percentage of H = 7.5%

Molar mass = 80g/mol

Molecular formula = ?

Solution:

Number of gram atoms of B = 40.3/ 10.8= 3.73

Number of gram atoms of N = 52.2/ 14 = 3.73

Number of gram atoms of H = 7.5 / 1 = 7.5

Atomic ratio:

  B              :            N                  :      H

3.73/3.73    :         3.73/3.73        :      7.5/3.73

     1            :            1                    :         2

B : N : H = 1 : 1 : 2

Empirical formula is  BNH ₂

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

n = 80 g/mol/ 26.8 g/mol

n = 3

Molecular formula = n (empirical formula)

Molecular formula = 3 (BNH ₂)

Molecular formula = B₃N₃H ₆

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3 years ago
3. What is the energy of a photon whose frequency is 5.2 x 1015 Hz? Use the equation: E = hxv
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Answer:

3. 3.45×10¯¹⁸ J.

4. 1.25×10¹⁵ Hz.

Explanation:

3. Determination of the energy of the photon.

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The energy of the photon can be obtained by using the following formula:

E = hv

E = 6.626×10¯³⁴ × 5.2×10¹⁵

E = 3.45×10¯¹⁸ J

Thus, the energy of the photon is 3.45×10¯¹⁸ J

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Wavelength (λ) = 2.4×10¯⁵ cm

Velocity (c) = 3×10⁸ m/s

Frequency (v) =?

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100 cm = 1 m

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2.4×10¯⁵ cm = 2.4×10¯⁵ cm × 1 m /100 cm

2.4×10¯⁵ cm = 2.4×10¯⁷ m

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Finally, we shall determine the frequency of the radiation by using the following formula as illustrated below:

Wavelength (λ) = 2.4×10¯⁷ m

Velocity (c) = 3×10⁸ m/s

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Drag and drop the terms into the correct locations to describe how the relationship between photosynthetic organisms and animals
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Explanation:

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