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The recommended daily allowance of methionine for an adult is 15 mg per kg of body mass. Tuna contains 755 mg of methionine per 100 g portion. Calculate the mass, in grams, of tuna that would provide the RDA of methionine for a 60 kg adult.

15mg per kilo recommended dose 15x60 = 900mg recommended dose for a 60kg adult There is 755mg per 100g portion of tuna So 900/755 = 1.19 times the amount in 100g of tuna is the recommended dose 1.19 x 100 = ...
DC
Answered by Darragh C. • Chemistry tutor
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I don't understand what exactly a mole is, could you please explain it to me?

Basicallly a mole refers to a number, in the same way as a dozen also refers to a number, this number being 12. Except instead of 12, the word mole refers to the number of 6 x 10 23 , which is basically a 6 ...
AP
Answered by Andrea P. • Chemistry tutor
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What is a mole?

A mole is a unit for amount of substance. This unit was created because we needed a common unit which could be used to convert from eg. number of atoms/molecules to grams or concentration to grams.
DB
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Why at room temperature is H2O a liquid, but H2S is a gas?

This question is basically just asking you why water has a higher boiling point that H 2 S. So you need to ask yourself what is the factor which means water has a higher boiling point? If you remember back t...
MK
Answered by Melissa K. • Chemistry tutor
47279 Views

NaOH is a strong base. An aqueous solution is made containing 0.300mol.dm^-3 of NaOH at room temperature. Calculate the pH of this solution.

Concentration of NaOH=Concentration of OH- ions (NaOH is a strong base) Kw=1x10^-14 (at room temperature/25 degrees) using Kw=[H+][OH-] We can figure out the [H+] [H+]=Kw/[OH-] [H+]=(1x10^-14) / (0.300) Now ...
NK
Answered by Nadine K. • Chemistry tutor
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