Answer: Total pressure of the gas will be 0.716atm.
Explanation: We are given a gas having initial conditions as
V = 27L
T = 32°C = 305K
P = 2.5atm
As the gas remains same, number of moles of a gas will also be same for initial and final conditions. To calculate the number of moles, we use ideal gas equation, which is,
.......(1)
where, R = gas constant = 
For calculating number of moles:

Putting the values of initial condition in this equation, we get

n = 2.696 mol
Now, the final conditions are,
V = 88.0L
T = 12°C = 285K
n = 2.696 mol (calculated above)
P = ? atm
Again using equation 1, we get


P = 0.716atm.
Answer:
Ionic bonds are formed between metals and nonmetals. The compatability of the metals and nonmetals is what makes them have a neutral charge as they cancel each other.
Eg: Using sodium chloride.
Na+ + Cl- > a neutral compound of NaCl without charges.
The chemical formula for aluminum flouride is C). AlF3.
Blank #1: Polyatomic
Blank #2: 2 (see explanation)
Blank #3: 1 (see explanation)
<h3>Explanation</h3>
Both the ammonium ion
and the sulfate ion
contain more than one atom in each ion. The two species are thus <em>polyatomic</em>. The chloride ion
, for example, is <em>monoatomic</em>.
Superscripts above formulae of the ions indicate their charge. Each ammonium ion carries a positive one (+1) charge. Each sulfate ion carries a charge of negative two (-2).
Ammonium sulfate is an ionic compound. A sample of this compound contain myriads of ammonium ions and sulfate ions. The ions are packed in three-dimensional lattices. Thus unlike water, ammonium sulfate does not exist as molecules in nature.
Assuming that the second and third blanks refers to a formula unit, rather than a molecule, of ammonium sulfate. The empirical formula of ammonium sulfate gives the minimum whole-number ratio between the two ions in a sample.
Charges shall balance between the two ions. Ammonium ions are of charge +1. Sulfate ions are of charge -2. The sample shall thus contain two ammonium ions for every one sulfate ion.
The empirical formula of ammonium sulfate is therefore
.
There are thus two ammonium ions
and one sulfate ion
in each formula unit of ammonium sulfate.