Answer: 1.93 x 10^24 molecules
Explanation:
CH4 is the chemical formula for methane, the first member of the alkane family.
Based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 molecule
So, 1 mole of CH4 = 6.02 x 10^23 molecules
3.2 moles of CH4 = Z
To get the value of Z, cross multiply:
(Z x 1 mole) = (6.02 x 10^23 molecule x 3.2 moles)
Z•mole = 19.26 x 10^23 molecules•mole
Divide both sides by 1 mole
Z•mole / 1 mole = 19.26 x 10^23 molecules•mole/ 1mole
Z = 19.26 x 10^23 molecules
Place Z in standard form
Z = 1.93 x 10^24 molecules
Thus, 3.2 moles of ch4 has 1.93 x 10^24 molecules
Answer : The correct option is, (b) +115 J/mol.K
Explanation :
Formula used :
where,
= change in entropy
= change in enthalpy of vaporization = 40.5 kJ/mol
= boiling point temperature = 352 K
Now put all the given values in the above formula, we get:
Therefore, the standard entropy of vaporization of ethanol at its boiling point is +115 J/mol.K
The particles move from an area of high concentration, to an area of low concentration, until the distribution of particles is equal
Plumbum. The latin word for liquid silver.
Answer:
o Surface Type- Because the atmosphere is heated by the Earth's surface, the surface type plays an important role in the surface air temperature. o Elevation and Aspect- Higher altitude generally has colder temps b/c the air is less dense and there are fewer molecules to absorb incoming solar radiation.
The Earth's surface is actually what heats the air above it.
Explanation:
The energy from the sun is "short-wave", and as such air is transparent to it. The sunlight goes right through the air without heating it at all. This "short-wave" radiation is absorbed by the Earth which then heats up. The heated Earth then emits it's own radiation but it is in the infrared part of the spectrum or "long-wave" radiation. This heat is what warms the atmosphere.
