Answer:
The molar enthalpy of vaporization in kJ/mol for butane = 24.265 kJ/mol.
Explanation:
- Firstly, we need to calculate the no. of moles of 4.00 g of liquid butane C₄H₁₀:
n = mass/molar mass = (4.0 g)/(58.12 g/mol) = 0.0688 mol.
∴ 0.0688 mol of butane requires a gain in enthalpy of 1.67 kJ to be evaporized.
<u><em>Know using cross multiplication:</em></u>
0.0688 mol of butane to be vaporized requires → 1.67 kJ.
1.0 mol of butane to be vaporized requires → ??? kJ.
∴ 1.0 mol of butane to be vaporized requires = (1.0 mol)(1.67 kJ)/(0.0688 mol) = 24.265 kJ.
<em>∴ The molar enthalpy of vaporization in kJ/mol for butane = 24.265 kJ/mol.</em>
Answer:
Genetic inheritance occurs due to genetic material, in the form of DNA, being passed from parents to their offspring. When organisms reproduce, all the information for growth, survival, and reproduction for the next generation is found in the DNA passed down from the parent generation.
Explanation:
Hoped its helped
A mixture of hydrogen and oxygen would not need to have a certain ratio of hydrogen atoms to oxygen atoms to differ from the compound known as water.
<h3>Why is water a compound not a mixture?</h3>
A water molecule has 2 hydrogen atoms bonded chemically to oxygen atoms and has the formula H₂O.
In a chemical reaction, two atoms react together chemically to form a new product which means the reactants lose their individual properties and obtain new properties of the product formed.
Hence, water is a compound as hydrogen and oxygen atoms are bonded chemically to each other.
On the other hand, if oxygen and hydrogen form a mixture which is a physical change then they retain their individual properties in the mixture. They do not need to be in a specific ratio and there are no chemical changes taking place.
Chemical change determines if a substance is a mixture or a compound.
Thus, a mixture of hydrogen and oxygen is different from water if it doesn't have a certain ratio of hydrogen atoms to oxygen atoms.
Learn more about mixture:
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The correct answer is A. The statement is true. Boiling happens when the pressure in a liquid sample is equal to the pressure of its surroundings or the atmospheric pressure. For this problem, we are given the pressure of the system as 745 mmHg which is clearly not equal to the atmospheric pressure of 761 mmHg therefore boiling cannot happen.