**Answer:**

1. m(NH₄)₂HPO₄ = 1.62 g

2. molesC₃H₇NO₂ = 1.79 moles

3. V = 4.87x10⁹ L

**Explanation:**

These questions are pretty easy to solve, using the correct expressions and formula.

1. To do this, we just need the density of the (NH₄)₂HPO₄. In this case, the reported density is 1.62 g/mL, therefore:

**d = m/V (1)**

Where:

d: density (g(mL)

m: mass of the compound (g)

V: volume of the compound (mL)

As we already have the volume, we can solve for m:

**m = d * V (2)**

m = 1.62 * 1

<h2>

**m(NH₄)₂HPO₄ = 1.62 g**</h2>

2. To do this, we need the atomic weights of each element that composes the alanine.

C: 12 g/mol; H: 1 g/mol; N: 14 g/mol; O: 16 g/mol

With these atomic weight, let's determine the molar mass of alanine:

MM C₃H₇NO₂ = 3(12) + 7(1) + 14 + 2(16) = 89 g/mol

Now to get the moles, we use the following expression:

**moles = m/MM (3)**

moles = 159 / 89

<h2>

**molesC₃H₇NO₂ = 1.79 moles**</h2>

3. We have the mass and density of the nitric acid, we just solve for Volume from expression (1) of part 1:

V = m/d (3)

V = 1.612x10¹⁰ pounds / 12.53 pounds/gallons

V = 1.287x10⁹ gallons

Converting this to liters:

V = 1.287x10⁹ * 3.7854

<h2>

**V = 4.87x10⁹ L**</h2>

Hope this helps