Chapter 2, Problem 70QRT

(a)

Interpretation Introduction

Interpretation:

Mass of $\text{2}\text{.5}\text{mol}$ boron has to be calculated.

Concept Introduction:

Molar mass:

Molar mass of any substance is the mass of one mole of that substance.

(b)

Interpretation Introduction

Interpretation:

Mass of $\text{0}\text{.015}\text{mol}{\text{O}}_{\text{2}}$ has to be calculated.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Mass of $\text{1}{\text{.25×10}}^{\text{-3}}\text{mol}\text{iron}$ has to be calculated.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

Mass of $\text{653}\text{mol}\text{He}$ has to be calculated.

Concept Introduction:

Refer to part (a).