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saw5 [17]
4 years ago
9

Grace leaves home and rides a distance of 60 km. It took her 3 hours. What is her speed?

Chemistry
1 answer:
lubasha [3.4K]4 years ago
5 0

Answer:

20 kph

Explanation:

60/3 (distance divided by time) =20

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The exhaust gas from an automobile contains 3% by volume of carbon monoxide (CO). Express this concentration in mg/m3 at 25oC an
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Answer:

24540\frac{mg}{m^3}

Explanation:

Hello,

In this case, since the 3% by volume is represented as:

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By using the ideal gas equation we compute the density of CO:

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Then we apply the conversion factors as follows:

=\frac{3L\ CO}{100L\ gas}*\frac{0.818g\ CO}{1L\ CO} *\frac{1000mg\ CO}{1g\ CO} *\frac{1000L\ gas}{1m^3\ gas} \\\\=24540\frac{mg}{m^3}

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