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3 years ago

Indicate the number of significant figures in the measured number 0.0020 A. 4 B. 5 C. 2

Chemistry

1 answer:

Sergio [31]3 years ago

6 0

<u>Answer:</u>

The correct answer option is C. 2.

<u>Explanation:</u>

We are given the number '0.0020' and we are to indicate the number of significant figures in the given measured number.

According to the rules of significant figures, numbers that are non-zero, zeros between any two significant numbers and the ending zeros in the decimal position are categorized as significant figures.

Since there is one non-zero number and one ending zero in the decimal position, therefore 0.0020 has 2 significant figures.

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2 years ago

Wine goes bad soon after opening because the ethanol in it reacts with oxygen gas from the air to form water and acetic acid , t

Fynjy0 [20]

Answer:

7.00 g

Explanation:

There is some information missing. I think this is the complete question:

<em>Wine goes bad soon after opening because the ethanol CH₃CH₂OH in it reacts with oxygen gas O₂ from the air to form water H₂O and acetic acid CH₃COOH, the main ingredient of vinegar. What mass of ethanol is consumed by the reaction of 4.86g of oxygen gas? Round your answer to 3 significant digits.</em>

<em />

First, we have to write the balanced equation.

CH₃CH₂OH + O₂ ⇒ CH₃COOH + H₂O

Then, we can establish the following relations:

The molar mass of O₂ is 32.0 g/mol
The molar ratio of O₂ to CH₃CH₂OH is 1:1
The molar mass of ethanol is 46.1 g/mol.

The mass of ethanol that reacts with 4.86 g of oxygen is:

$4.86gO_{2}.\frac{1molO_{2}}{32.0gO_{2}} .\frac{1molEt}{1molO_{2}} .\frac{46.1gEt}{1molEt} =7.00gEt$

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3 years ago

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Citrus2011 [14]

Answer:

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