Question

Which of the following relationships is not true for an ideal gas? Select one: 1. PV = constant when temperature and moles of gas are held constant 2. V/T = constant when pressure and moles of gas are held constant 3. nT = constant when pressure and volume are held constant 4. P/n = constant when volume and temperature are held constant 5. All the statements in this question are true

Answer #1

**ANSWER:**

The ideal gas equation is:

PV = nRT

where, R is a gas constant and its value is fixed 8.314 J/mol K.

1.) If number of mole (n) of gas and temperature (T) will be constant, then

PV = nRT

PV = constant x constant x constant

PV = constant.

**Hence, statement (1) is true for an ideal
gas.**

2.) If number of mole (n) of gas and pressure (P) will be constant, then

PV = nRT

constant x V = constant x constant x T

V/T = constant.

**Hence, statement (2) is true for an ideal
gas.**

3.) If pressure (P) and volume (V) will be constant, then

PV = nRT

constant x constant = n x constant x T

nT = constant.

**Hence, statement (3) is true for an ideal
gas.**

4.) If volume (V) and temperature (T) will be constant, then

PV = nRT

P x constant = n x constant x constant

P/n = constant.

**Hence, statement (4) is true for an ideal
gas.**

5. All the statements in this question are true
(**correct)**

± Stoichiometric Relationships with Gases
The ideal gas law
PV=nRT
relates pressure P, volume V, temperature
T, and number of moles of a gas, n. The gas
constant Requals 0.08206 L⋅atm/(K⋅mol) or 8.3145
J/(K⋅mol). The equation can be rearranged as follows to solve for
n:
n=PVRT
This equation is useful when dealing with gaseous reactions because
stoichiometric calculations involve mole ratios.
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Check all that apply.
Check all that apply.
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Part
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