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Gennadij [26K]
3 years ago
15

Will give brainliest!! Explain how extinct organisms have left their evidence behind, which scientists now study.

Chemistry
1 answer:
mrs_skeptik [129]3 years ago
3 0

theyre fossils, when extinct beings such as dinosaurs died their bones would sometimes get stuck in clay or amber (i cant remember if theres any other types of rock) or sediment) and stay there for years and years then scientist called Paleontologists find them and study them. hope this helps:)

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<u>Answer:</u> 4.999 moles of excess reactant will be left over.

<u>Explanation:</u>

Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.

Excess reagent is defined as the reagent which is left behind after the completion of the reaction.

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}       .....(1)

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For the given chemical reaction:

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By the stoichiometry of the reaction:

2 moles of aluminium carbide reacts with 12 moles of water

So, 0.778 moles of aluminium carbide will react with = \frac{12}{2}\times 0.778=4.668 mol of water

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Putting values in equation 1:

\text{Moles of water}=\frac{174g}{18g/mol}=9.667mol

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Hence, 4.999 moles of excess reactant will be left over.

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