3 years ago

Define atomic number

1 answer:

8 0

Answer:

the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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It is used as a catalyst.

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Explain how a substances flammability can indicate a chemical change.

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Explanation:

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3 years ago

A chemist has 3.55x1022 molecules of nitrogen monoxide. How

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Answer:

<h2>0.059 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

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L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{3.55 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.05897...$

We have the final answer as

<h3>0.059 moles</h3>

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a chemist uses hot hydrogen gas to convert chromium (iii) oxide to pure chromium. how many grams of hydrogen are needed to produ

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3 years ago

Define atomic number ​

Define atomic number