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tekilochka [14]
2 years ago
11

Akio just got over having the flu. His brother just got the flu. His parents are not worried about Akio getting it again because

he built up an immunity to this flu strain. Which explains the type of immunity he built up?
Chemistry
2 answers:
AleksandrR [38]2 years ago
8 0

Answer:

active because he built up antibodies due to exposure to the flu

Explanation:

kozerog [31]2 years ago
8 0

Answer:

A

Explanation:

have a nice day

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Calculate the molecular weight of a substance. In which the solution of this substance in the water has a concentration of 7 per
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Answer : The molecular weight of a substance is 157.3 g/mol

Explanation :

As we are given that 7 % by weight that means 7 grams of solute present in 100 grams of solution.

Mass of solute = 7 g

Mass of solution = 100 g

Mass of solvent = 100 - 7 = 93 g

Formula used :  

\Delta T_f=i\times K_f\times m\\\\T_f^o-T_f=k_f\times\frac{\text{Mass of substance(solute)}\times 1000}{\text{Molar mass of substance(solute)}\times \text{Mass of water(solvent)}}

where,

\Delta T_f = change in freezing point

T_f^o = temperature of pure water = 0^oC

T_f = temperature of solution = -0.89^oC

K_f = freezing point constant of water = 1.86^oC/m

m = molality

Now put all the given values in this formula, we get

(0-(-0.89))^oC=1.86^oC/m\times \frac{7g\times 1000}{\text{Molar mass of substance(solute)}\times 93g}

\text{Molar mass of substance(solute)}=157.3g/mol

Therefore, the molecular weight of a substance is 157.3 g/mol

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Separate this redox reaction into its component half-reactions. 3o2 4co
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The equation is:
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Reduction half reaction:
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