Hi this is a biochemistry assignment The question is

If 45mg of A (MW 190D) is dissolved in 10 ml of water in a test tube incubated at 23 degrees with an appropriate catalyst until equilibrium is reaches, what is the concentration of F?

I know how to do the problem, but what I am am having a slight problem with is how to get the concentration of A from the information given.. which is 45 mg of A ( MW 190D) dissolved in water. Also Have any one came across MW 190D? If so what does thiss mean? I have searched and could not find it.

I think the MW of 190D must be a typo. Molecular weight is only ever a number.

EDIT

If it is homework just do the calculation assuming the MW is 190 (not an unreasonable number) and maybe write a note saying you didn't understand what the D is about. You'll get the marks for doing the calulation right which is what they are testing anyway.

Q=mc/\T
Q=amount of heat required to cause the temperature change(expressed in calories)

m=mass of material experincing the temperature change(expressed in grams)

c=specific heat capacity, a measurement of the material's ability to retain heat(expressed in cal/g*C)

/\T= the change in the temperatue of the material(expressed in *C

A 500g sample of an unknown material requires 750 calories of heat to raise its temperature by 50*C. solve for c

Quote:

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If 45mg of A (MW 190D) is dissolved in 10 ml of water in a test tube incubated at 23 degrees with an appropriate catalyst until equilibrium is reaches, what is the concentration of F?

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I'm pretty sure that means "MW 190 Daltons", though usually they use "Da" and not just "D". A Dalton is the mass of a hydrogen atom, or a proton or a neutron. It's the "atomic mass unit". So, "MW 190D" = Molecular Weight = 190 grams/mole.

Atomic mass unit - Wikipedia, the free encyclopedia

So