Answer:
9,480 mg
Explanation:
he average caffeine content of an 8-oz, brewed cup of coffee is 95 mg. A single espresso or espresso-based drink contains 63 mg, and decaf coffee contains about 3 mg of caffeine (on average).
Answer:
Chromium is reduced in forward reaction
Explanation:
A species is said to be oxidized if oxidation number of the species increases.
A species is said to be reduced if oxidation number of the species decreases.
Oxidation number of Cr in = +6
Oxidation number of Cr in = +3
So change in oxidation number of Cr in forward reaction = (+3)-(+6) = -3
Hence oxidation number of Cr decreases on going from to .
So, chromium is reduced in forward reaction.
Answer:
q = - 3.569KJ 0r 3.569KJ Liberated heat (signifying the change in heat is negative)
Explanation:
liberated heat implies that change in heat is negative , therefore
q = -m c ΔT
where, m = mass of the Silver = 249 g
c = specific heat capacity of Silver = 0.235 Jg^{-1} °C^{-1
ΔT = change in temperature = 87°C- 26 °C= 61°C
q = -m x c x ΔT
= - 249 x 0.235 x 61 = - 3569.415J rounded to -3569J
Changing to KJ becomes= -3569/1000= - 3.569 KJ
q = - 3.569KJ 0r 3.569KJ liberated heat.
It is possible to turn aldehydes and ketones into alkenes via the Wittig reaction.
<h3><u>What is wittig reaction ?</u></h3>
- The Wittig Reaction: It is possible to turn aldehydes and ketones into alkenes via the Wittig reaction, which is a practical process.
- Georg Wittig, its creator, received the 1979 Nobel Prize in Chemistry for it (along with the father of hydroboration, H.C. Brown).
- A carbonyl molecule (aldehydes and ketones both function, but esters or amides do not) and a fairly peculiar-looking species known as a ylide are the two ingredients in this reaction. (more precisely, a "phosphonium ylide," as there are also ylides of nitrogen and sulfur).
- An ylide is a species having opposing formal charges on nearby atoms, according to technical definition. The ylide, which we shown above with a double bond between carbon and phosphorus, also has a significant resonance form with a positive charge on phosphorus and a negative charge on carbon.
To view more about wittig reaction, refer to:
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If we are given the mass, the volume that the certain substance occupies is calculated by using the density in the equation,
V = m/D
where V is the volume, mi s the mass, and D is density. From the reliable sources, the value of the density of the substance is equal to 2,700 kg/m³.
Substituting the known values from to the equation,
V - (6.56 kg)/(2700 kg/m³)
V = 2.429 x 10^-3 m³
Answer: 2.429 x 10^-3 m³