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LUCKY_DIMON [66]
3 years ago
5

A ruler has markings as shown below. Stefan uses this ruler to measure the length of a metal rod. How many decimal places should

his answer include? 1 2 3 4
Chemistry
2 answers:
Shkiper50 [21]3 years ago
7 0

Answer:

1 decimal places

Explanation:

amm18123 years ago
3 0

<span>Each ruler has markings and the usual measurement is 1 foot, which is equivalent to twelve inches. The little lines between the inches is compose of 16 lines and the smallest unit of measurement is 1/ 16 of an inch. The longer the line, the larger the measurement.  Therefore, Stefan should include two decimal places in his measurements.</span>

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Answer:

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Explanation:

Hello,

At first, for the combustion of octane, the following chemical reaction is carried out:

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Thus, the produced mass of carbon dioxide is:

m_{CO_2}=5.00x10^4gC_8H_{18}*\frac{1molC_8H_{18}}{114gC_8H_{18}}*\frac{8molCO_2}{1molC_8H_{18}}*\frac{44gCO_2}{1molCO_2} \\\\m_{CO_2}=1.54x10^5gCO_2

Now, for ethanol:

C_2H_6O+3O_2\rightarrow 2CO_2+3H_2O

m_{CO_2}=5.00x10^4gC_2H_6O*\frac{1molC_2H_6O}{46gC_2H_6O}*\frac{2molCO_2}{1molC_2H_6O}*\frac{44gCO_2}{1molCO_2} \\\\m_{CO_2}=9.57x10^4gCO_2

Best regards.

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Answer:

Here's what I get  

Explanation:

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