3.88 x 10²⁰ molecules in a cup of coffee.
<h3>Equation :</h3>
moles = mass /molar mass
moles = 125 x 10⁻³ / C8H10N4O2
moles =125 x 10⁻³ / (12 x 8) + (10 x 1) + (14 x 4) + (16 x 2)
moles = 125 x 10⁻³ / 194
moles = 6.44 x 10⁻⁴ moles
molecules = moles x Avogadro's number
molecules = 6.44 x 10⁻⁴ x 6.022 x 10 x 23
molecules = 3.8 x 10²⁰ molecules
<h3>What is caffeine common name?</h3>
Trimethylxanthine is more commonly referred to as caffeine (C8H10N4O2) (systematic name is 1,3,7-trimethylxanthine or 3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione). Coffeine, theine, mateine, guaranine, or methyltheobromine are additional names for the substance.
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As mass =mol multiply by mass number so u find the mass number of phosphide which is given and multiply it by 1
Answer:
50mL
Explanation:
Using Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressure (torr.)
P2 = final pressure (torr.)
V1 = initial volume (mL)
V2 = final volume (mL)
According to the information provided in the question,
V1 = 25.0mL
V2 = ?
P1 = 760 torr.
P2 = 380 torr.
Using P1V1 = P2V2
V2 = P1V1//P2
V2 = (760 × 25) ÷ 380
V2 = 19000 ÷ 380
V2 = 50mL
cobalt has a larger atomic radius
This question is recalling the behavior of real gases in contrast to ideal gases, defined by the van der Waals equation and the ideal gas law respectively, and a reason behind the increasing discrepancy is required.
In such a way, we can start by considering the attached picture in which the choices are shown and clearly, the answer is "<u>as the polarity of the molecules increase</u>".
The aforementioned can be explained with the concept of intermolecular forces, because ideal gas theory states that ideal gas molecules do not interact one to another, and, as the polarity of the molecules increase, these intermolecular forces increase their frequency and strength, and will lead to the formation of associations, which fail to be numerically modelled by simple equations of state such as van der Waals, Redlich-Kwong, Peng-Robinson, etc,.
These associations are, of course, thoroughly neglected by the ideal gas law whereas the ones included in the van der Waals equation, which are not the most reliable, merely attempt to approach this phenomenon, which cause the mentioned discrepancy. As an additional data, robust equations of state, such as CPA (cubic plus association) are able to provide reliable results when working with highly polar gases but turn out really tough to work with due to its mathematical complexity.
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