Posted by Anonymous on .
Okay this is embarrassing but I seem to have lost my ability to do the math.... If my problem is:
200.0mg/1* 1g /1000mg* 1 mol/206.31g=
I can't remember if I have to multiply the two bottom ones first or if I just input the information in my calculator I got two answers 41.262 and 0.0009694....

Chemistry 
DrBob222,
The answer is the second one.
Punch in the first 200, hit the divide key and punch in the first denominator *1000) and hit the = key. The punch the x button, punch in 1, and hit the divide key, unch in 206.31 and hit the = key. 0.0009694. You CAN multiply 200 x 1 x 1 and divide by (1000 x 206.31) but that means writing down answers. The first way above keeps everything in the calculator and waits on the next step. 
Chemistry 
Anonymous,
Thank you my brain is muddled in a sickness cloud!!