The following table shows the symptoms in four patients. Each patient suffers from a different disease.

Chemistry

2 answers:

RideAnS [48]3 years ago

6 0

Answer:

D. Food poisoning, Bacteria Vomiting, loose stools

ryzh [129]3 years ago

5 0

I’d say D.

I was tempted on C but then I remembered that food poisoning is often caused by an infectious disease and the presence of bacteria in the stomach accompanied by vomiting and loose stools (also caused by bacteria presence in gut).

Hope this helped!

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The depletion of ozone (O3) in the stratosphere has been a matter of great concern among scientists in recent years. It is belie

gayaneshka [121]

Answer: 0.736 g

Explanation:

$O_3+NO\rightarrow O_2+NO2$

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

$\text{Number of moles of}O_3=\frac{0.781g}{48g/mol}=0.016moles$

$\text{Number of moles of}NO=\frac{0.589g}{30g/mol}=0.019moles$

By Stoichiometry:

1 mole of ozone $O_3$ reacts with 1 mole of nitric oxide $NO$ to form 1 mole of nitrogen dioxide $NO_2$

0.016 moles of ozone reacts with= $\frac{1}{1}\times 0.016=0.016moles$ of nitric oxide to form 0.016 mole of $NO_2$

Thus ozone is the limiting reagent as it limits the formation of products and nitric oxide is the excess reagent as (0.019-0.016) g= 0.003 g remains as such.

Mass of $NO_2=moles\times {\text{Molar mass}}=0.016\times 46=0.736g$