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Phantasy [73]
3 years ago
10

How to write an table of content ​

Chemistry
1 answer:
Brrunno [24]3 years ago
4 0
Click where you want to insert the table of contents – usually near the beginning of a document.
Click References > Table of Contents and then choose an Automatic Table of Contents style from the list.
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The order of elements in the periodic table is based on of elements in the periodic table is based on
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The increasing atomic number
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Which two elements make up the greatest percentages by mass in Earth’s crust?
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4 0
2 years ago
Given the speed of light as 3.0 × 108 m/s, calculate the wavelength of the electromagnetic radiation whose frequency is 7.5 × 10
arlik [135]
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3 0
3 years ago
Us
MrRissso [65]

Answer:

24.9%

Explanation:

According to this question, mole fraction of NaCl in an aqueous solution is 0.0927. This means that the mole percent of NaCl in the solution is:

0.0927 × 100 = 9.27%

Let's assume that the solution contains water (solvent) + NaCl (solute), hence, the mole fraction of water will be;

100% - 9.27% = 90.73%

THEREFORE, it can be said that, NaCl contains 0.0927moles while H2O contains 9.073moles

N.B: mole = mass/molar mass

Given the Molar Mass

NaCl: 58.44 g/mol

H2O: 18.016 g/mol

For NaCl;

0.0927 = mass/58.44

mass = 0.0927 × 58.44

5.42g

For H2O;

9.073 = mass/18.016

mass = 9.073 × 18.016

= 16.35g

Total mass of solution = 16.35g + 5.42g = 21.77g

Mass percent of NaCl = mass of NaCl/total mass × 100

% mass of NaCl = 5.42g/21.77g × 100

= 0.249 × 100

= 24.9%

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3 years ago
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Which statement correctly describes two forms of oxygen, O2 and O3?
fgiga [73]
The two forms of oxygen, O2 and O3 is "<span>They have different molecular structures and different properties."</span>
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