Chapter 14, Problem 78AE

(a)

Interpretation Introduction

Interpretation:

Moles of hydrogen liberated from reaction of $200.0\text{ mL}$ of $3.00M\text{ HCl}$ with excess of magnesium have to be determined.

Concept Introduction:

Stoichiometry describes quantitative relationships between reactants and products in any chemical reactions. In these problems, amount of one species is determined with help of known amount of another species.

(b)

Interpretation Introduction

Interpretation:

Volume of hydrogen gas $\left(\text{L}\right)$ obtained at $27°\text{C}$ and $720\text{ torr}$ has to be determined.

Concept Introduction:

Expression for ideal gas equation is as follows:

  $PV=nRT$        (3)

Here,

$P$ is pressure of gas.

$V$ is volume of gas.

$n$ is moles of gas.

$R$ is universal gas constant.

$T$ is absolute temperature of gas.