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a 2,24 lit

ko cs j

I think we need to stay healthy to prevent the flu, keep as healthy as i can by taking good care of myself. Sleep and nutritional considerations are help to prevent the onset of a cold or flu, a healthy lifestyle helps my immune system to be in its best possible shape, giving me the best chance of being able to fight off the onset of a cold or flu.
I need to eat healthily. Healthy foods such as vegetables, fruit, grains, etc., are an important part of keeping my body nutrition at its optimum. Processing fatty and sugary foods don't give the immune-boosting protection that healthier food does. Sugary foods can decrease immune function.
Exercise regularly. Exercise has enhancing immune system that can help ward off illness. Overdo too much strenuous or excessive can leave me prone to illness, too. I make sure to get adequate sleep every night, get at least seven to eight

giúp mình câu này nhé mình cản ơn

1. A

2. A

3. C

4. C

5. B 

a. \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)

\(n_{Fe}=\frac{11,2}{56}=0,2mol\)

b. Theo phương trình \(n_{HCl}=n_{Fe}.2=0,2.2=0,4mol\)

\(\rightarrow V_{ddHCl}=\frac{0,4}{2}=0,2l=200ml\)

c. Theo phương trình \(n_{FeCl_2}=n_{Fe}=0,2mol\)

\(\rightarrow C_{M_{ddFeCl_2}}=\frac{0,2}{0,2}=1M\)

\(S_{KNO_3}=\frac{m_{KNO_3}.100}{m_{H_2O}}=\frac{100.24}{80}=30g\)