To determine the pOH assuming water is the universal solvent take the value of 10 ^ -14 and then divide it by the hydronium concentration and then take the negative logarithm of the final answer that is the solution to the hydroxide ion concentration in the solution.

**Answer:**

**Explanation:**

The concentration of CO2 in the room will be the amount of CO2 in the room at time t, divided by the volume of the room.

Let A(t) be the amount of CO2 in the room, in ft3 CO2.

The air entering the room is 3000 ft3/min with 0.06% concentrarion of CO2. That can be expressed as (3000*0.06/100)=1.8 ft3 CO2/min.

The mixture leaves at 3000 ft3/min but with concentration A(t)/V. We can express the amount of CO2 leaving the room at any time is A(t).

We can write this as a differential equation

We can rearrange and integrate

We also know that A(0) = 12000*(0.3/100)=36 ft3 CO2.

Then we have the amount A(t) as

**Answer: Option (b) is the correct answer.**

**Explanation:**

When copper wire is place into the atmosphere or anywhere then there is possibility that some oxide layer or impurity must have deposited over its surface.

So, when we sanded copper wire then these impurities get removed and copper metal gets exposed onto the surface.

Thus, we can conclude that **you sanded the copper wire before burning it to make sure that copper metal was exposed on the surface of the wire.**

The coefficient should be 3 because 2(N)H3 has 6 hydrogen atoms and 3H2 also has 6 hydrogen atoms

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