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lina2011 [118]
2 years ago
13

Are elements matter and why?

Chemistry
1 answer:
nata0808 [166]2 years ago
4 0

All matter is made up of substances called elements, which have specific chemical and physical properties and cannot be broken down into other substances through ordinary chemical reactions. Gold, for instance, is an element, and so is carbon. There are 118 elements, but only 92 occur naturally.

<h3><u>P</u><u>LEASE </u><u>MARK</u><u> ME</u><u> BRAINLIEST</u><u>.</u></h3>
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<span>Data:

1) molar mass: 58.0714 g.

2) mass analysis

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<span>What is the percent composition of all the components in the liquid?

mass of C + mass of H + mass of O = 18g + 3g + 8g = 29 g

Percent composition:

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O: (8g / 29g) * 100 = 28%
                               --------------
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What is the empirical formula of the compound?

Convert masses to number of moles by dividing each mass by the atomic mass of the correspondant element:

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O: 8 g / 16 g/mol = 0.5 mol

Divide each number of moles by the smaller, i.e. 0.5 mol

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What is the molecular formula of the unknown liquid?

First,calculate the molar mass of the empirical formula:

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Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. Which word equation best represents this chemical reaction
Oksana_A [137]

Answer:

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Explanation:

Word equation:

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The given reaction is combustion of isopropanol. Isopropanol burn in the presence of oxygen and produced carbon dioxide and water. Heat is also produced in this reaction.

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As, the number of serving in 0.004269 moles of NaCl = 1 serving

So, the number of serving in 0.0230 moles of NaCl = \frac{0.0230}{0.004269}=5.39 serving

Thus, the number of servings of this potato chips eaten to consume 0.0230 moles of NaCl must be, 5.39

8 0
3 years ago
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