The answer is 3 moles as per given balanced equation one mole Zn produces 1mole Hydrogen
when reacted with excess acid.
So 3 moles Zn will give 3moles Hydroge

4 0

3 years ago

At a certain temperature the vapor pressure of pure heptane (C_7 H_16) is measured to be 170. torr. Suppose a solution is prepar

steposvetlana [31]

Explanation:

The given data is as follows.

Pressure (P) = 170 torr, mass of heptane (m) = 86.7 g

First, we will calculate the number of moles as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{86.7 g}{100 g/mol}$

= 0.867 mol

Now, the number of moles of $CH_{3}COBr$ are calculated as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{125}{122.9}$

= 1.07

Therefore, mole fraction of heptane will be calculated as follows.

Mole fraction = $\frac{\text{moles of heptane}}{\text{total moles}}$

= $\frac{0.867}{0.867 + 1.07}$

= $\frac{0.867}{1.937}$

= 0.445

Now, we will calculate the partial pressure of heptane as follows.

$P_{A} = x_{A}P^{o}_{A}$

= $170 \times 0.445$

= 75.65 torr

Thus, we can conclude that the partial pressure of heptane vapor above this solution is 75.65 torr.

8 0

4 years ago

In which changes do the particles move further apart? W Х gas liquid solid Y Z

lesantik [10]

Particles move further apart in gas

5 0

3 years ago

What is the function of the cell membrane

enot [183]

It is supposed to protect the cell from it's surroundings, or from the outside.

8 0

3 years ago