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viva [34]
2 years ago
12

True or false: The nucleus of an atom contains protons and neutrons.

Chemistry
1 answer:
KonstantinChe [14]2 years ago
6 0

Answer:

true

Explanation:

google

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A sample of C3H8 has 6.72 x 10^24 H atoms. <br> What is the total mass of the sample?
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The answer is 492.8 g


1. Calculate a number of moles of a sample.
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3. Calculate a mass of the sample. 

1. Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance: 6.023 × 10²³ units per 1 mole    

6.023 × 10²³ atoms : 1 mol =6.72 × 10²⁴ atoms : n

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Mr(C3H8) = 3 * Ar(C) + 8 * Ar(H) = 3 * 12 + 8 * 1 = 36 + 8 = 44 g/mol



3. Mass (m) of a sample is number of moles (n) multiplied by molar mass (Mr) of C3H8:

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1 point<br> How many moles of CO2 are there in 100.0 grams of CO2?
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