Answer:
the answer of your question is below:
Explanation:
decay
<u>Answer:</u> The volume when the pressure and temperature has changed is 400 mL
<u>Explanation:</u>
To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.
The equation follows:

where,
are the initial pressure, volume and temperature of the gas
are the final pressure, volume and temperature of the gas
We are given:

Putting values in above equation, we get:

Hence, the volume when the pressure and temperature has changed is 400 mL
Answer:
Molecular formula = C₄H₆
Explanation:
Given data:
Molecular mass of compound = 54 g/mol
Empirical formula = C₂H₃
Molecular formula = ?
Solution:
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = 12×2 + 3×1 = 27 g/mol
n = 54 / 27
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2(C₂H₃)
Molecular formula = C₄H₆
Iron is described as an element because it is a pure substance. A pure substance is where the atoms are similar and cannot be divided into smaller.