How many grams of coffee a day are an excess?
Posted by scottparat on 04 Mar 2010 | Tagged as: Coffee Questions
I think I may drink around or more than 10 grams of coffee a day, is this an excess? How much is an excess and what’s the average of grams per cup of coffee? If somebody knows please, I need to know…
I just want a simple answer, not a process, please anyone…?
I consider this to be improtant, I’m addicted to caffeine and I must know which are the right amounts.
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on 04 Mar 2010 at 3:15 am 1.Hawaii-5-O said …
http://en.wikipedia.org/wiki/Caffeine
Listen just don’t go over one large caffeine type beverage,say a large McDonald iced coffee once a day IN THE MORNING.
Try not to exceed 200mg a day caffeine and try not drink a lot of caffeine within 6-8 hours of going to sleep.
Caffeine content in common Products
http://lds.about.com/library/weekly/aa121202b.htm
Product / Caffeine
(in milligrams)
Coffee (6 oz. cup)
Drip 175
Percolated 132
Instant regular 64
Decaffeinated 3
Cola Drinks (12 oz)
Coca-Cola Classic 46
Coca-Cola, new 46
Coke Free 0
Pepsi 43
Pepsi Free 0-2
Dr. Pepper 38
Mountain Dew 52
Tab 50
Jolt 71
44 oz. cup of Coke/Pepsi 169/158
Tea (5 min. brew, 6 oz) 24-60
Cocoa and chocolate
Cocoa beverage (water mix, 6 oz) 18
Milk chocolate candy bar (8 oz) 48
Baking chocolate (1 oz) 35
White chocolate 0
Carob (chocolate substitute) 0
Nonprescription drugs
Caffedrine capsules (each) 100
NoDoz tablets (each) 100
Weight-control aids
Dexatrim (daily dose) 200
Dietac (daily dose) 200
Prolamine (daily dose) 280
Instant coffee 146 mg per cup
Cocoa 110 mg per cup
Decaffeinated coffee 4 mg per cup
Loose tea, 5 minute brew 40 mg per cup
Bag tea, 5 minute brew 46 mg per cup
Coca-cola 65 mg per 12-ounce can
Diet Dr. Pepper 54 mg per 12-ounce can
Dr. Pepper 61 mg per 12-ounce can
Mountain Dew 55 mg per 12-ounce can
Pepsi-Cola 43 mg per 12-ounce can
Excedrin 65 mg per tablet
Midol 132 mg per tablet
No-Doz 100 mg per tablet
Caffeine intoxication
Main symptoms of caffeine intoxication.[58]An acute overdose of caffeine, usually in excess of about 300 milligrams, dependent on body weight and level of caffeine tolerance, can result in a state of central nervous system over-stimulation called caffeine intoxication (DSM-IV 305.90),[81] or colloquially the "caffeine jitters". The symptoms of caffeine intoxication are not unlike overdoses of other stimulants. It may include restlessness, nervousness, excitement, insomnia, flushing of the face, increased urination, gastrointestinal disturbance, muscle twitching, a rambling flow of thought and speech, irritability, irregular or rapid heart beat, and psychomotor agitation.[79] In cases of much larger overdoses, mania, depression, lapses in judgment, disorientation, disinhibition, delusions, hallucinations, and psychosis may occur, and rhabdomyolysis (breakdown of skeletal muscle tissue) can be provoked.[82][83]
on 04 Mar 2010 at 3:15 am 2.Nesha said …
[I will use the general word equation: calcium hydroxide reacts with lithium bromide to produce calcium bromide and lithium hydroxide; as an example, throughout each step, to aid in your learning]
(1) Write the correct chemical formula for each substance in the reaction. Be certain each chemical equation is correct! (ex: calcium hydroxide: correct formula = Ca(OH)2; NOT CaOH.)
(2) Write out the chemical equation; ex: Ca(OH)2 + LiBr gives CaBr2 + LiOH
(3) Balance this chemical equation; ex: Ca(OH)2 + 2LiBr gives CaBr2 + 2LiOH
Note: this balanced equation is TELLING you that one mole of calcium hydroxide is reacting with 2 moles of lithium bromide to produce (gives) one mole of calcium bromide and 2 moles of lithium hydroxide. It is TELLING you the relative number of moles of each substance.
(4) Determine the MOLE RATIO of the substances involved; ex: if the question says you have 1.0 moles of calcium hydroxide and it reacts with an excess of lithium bromide, and asks how many moles of lithium hydroxide are produced, the answer would be 2.0 moles of lithium hydroxide. In other words, the MOLE RATIO of calcium hydroxide to lithium hydroxide is 1 to 2, also written as a “1:2 ratio“. ex: same question but suppose you have 3 moles calcium hydroxide. Because the mole ratio is 1:2, you would produce 6 moles of lithium hydroxide. A ratio of 3:6 = a ratio of 1:2; (you just reduced it to simpler terms).
Stop here if you are simply given the number of moles of product you have, and asking how many moles of some different substance are produced in a chemical reaction.
Same type of problems, but working with grams instead of moles:
you simply have to do a couple of extra steps:
I will use the same reaction as above, but will change the question to this:
“If you have 255 grams of calcium hydroxide, how many grams of lithium hydroxide will be produced, (assuming you have an excess of lithium bromide)”.
[Note: unless the question states otherwise, assume you have an excess of the other reactant, thus giving the maximum yield of product; see “Limiting Reagents” below to solve those types of problems].
To solve, complete the first 4 steps above (we’ve just done that):
(5) Convert grams of substance into moles of substance!!! This is essential in solving these types of problems. THE KEY STEP FOR ALL PROBLEMS OF THIS TYPE IS TO ALWAYS CONVERT EVERYTHING INTO MOLES FIRST!!! The general formula’s are as follows:
Moles = grams / molecule weight
Or you can use basic algebra and say the following:
Grams = Moles X molecular weight
[Note: “molecular weight” is used to describe molecules; “formula weight” is used to describe ionic compounds; and “atomic weight” is used to describe elements; ALL of them are the sum of all the atomic weights of the elements in the substance. In the case of a single element, alone by itself, this refers to the atomic weight of that element. Note that the 7 elements: hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine only exist as “diatomic” elements, when they are ALONE by themselves (not combined with any other element(s)). Thus H2, is the correct way to write the chemical formula for hydrogen when it is all alone, by itself. And it is a molecule, and it’s molecular weight would be equal to 2.0. This is the same for the all diatomic molecules: the molecular weight will equal double the atomic weight for that particular diatomic element (because there are TWO atoms, not just one, in these diatomic molecules). This is ONLY true for these seven elements, when they appear ALONE in a chemical equation].
{The example I have shown here does NOT contain any diatomic elements, but if it did, the problems are still solved in a similar manner}.
Ex: if we have 255 g of calcium hydroxide, convert this to moles
Moles Ca(OH)2 = 255 g of Ca(OH)2 / 78.1 g/mol Ca(OH)2
= 3.27 mol Ca(OH)2
(6) According to the mole ratio, determined in step 4 above, you have a mole ratio of 1 mol Ca(OH)2 gives 2 moles of LiOH; in other words, you have a 1:2 mole ratio.
Ex: thus, 3.27 moles Ca(OH)2 will give 6.54 moles of LiOH [2 x 3.27 = 6.54]
(7) To convert 6.54 moles of LiOH into grams, use the second formula given above:
Ex: Grams = moles X molecular weight
Grams LiOH = 6.54 moles LiOH X 23.9 grams/mole LiOH
= 156.3 grams LiOH
LIMITING REAGENTS: Same type of problem, except this time you have a Limited amount of reagent:I will use the same chemical reaction as above, but will change the question to this:
“If you have 255 grams of calcium hydroxide, and 52.0 grams of lithium bromide, how many grams of lithium hydroxide will be produced?”
To solve, complete the first 4 steps above (we’ve just done that).
(5a) We’ve already calculated that we have 3.27 mole of Ca(OH)2 We will use that later, so save that answer. Now, calculate the number of moles of lithium bromide you have if you have 52.0 grams of lithium bromide:
Moles LiBr =
on 04 Mar 2010 at 3:15 am 3.Amanda said …
10 grams of coffee doesn’t help me much. Do you mean 10 grams of ground-up coffee? That’s about one strong cup American measure (or a cup and a half European), so you’re fine. If you drink one tiny 10g swallow of brewed coffee per day, I’m not sure why you bother.
How much ground coffee goes into a cup? That depends on how big a cup is to you and how strong you like your coffee, so it’s hard to tell. I know I have coffee scoops labeled 1 tsp = 7g = 4 oz brewed coffee, so that’s a good ratio to start with for good coffee prepared strong. So that’s 2 teaspoons per 8-oz cup (or even 6-oz cup if you like coffee Starbucks style). If you like your coffee weaker, cut back as far as 1 tsp/8 oz and ignore the coffee geeks when they laugh at you.