Recent content by quarkboy

NaBH4 by mass ...partial solution Calculated Molecular Weight MW NaBH4 : 23 + 11 + 4 = 38g Convert to moles - NaBH4 12g NaBH4 / 100g NaBH4 * 1 mole NaBH4 / 38g = 0.0032 moles NaBH4However, at this point I need to write a balanced equation for the Acetophenone and NaBH4 reactants ? I am not...

Im taking an organic chemistry lab, must calculate the following: NaBH4 is normally prepared for use in basic aqueous solution. Calculate the mass of a 12% NaBH4 aqueous solution required theoretically to reduce 5.00 g of acetophenone. I am can probably have a go at this question if I can get...

Thanks. Refer to Original Post.

Recrystallization Questions - help needed urgent! I can't figure this out, please help... I will update with answers as I get them. 1. Compound A has a solubility in ethyl acetate of 18 mg per 50 mL at 20 Celsius, and a solubility of 0.28g per 50 mL at 75 Celsius. You are given a sample...

Yes. Correct. I do believe that was the goal of the question, to do it via your method. Thank you for your enlightened thinking.

this is what I worked out... CORRECT ANSWER! 1. calculated R = resultant vector = 47 N Force using trigonometry. 2. F = ma , Therefore a = F/m 3. acceleration is 1.2 m/s-2 There could be another way to work this problem out, not sure. Thanks for the solution StephenP :smile:

Newtons Theory & Vector Solution ---------------------------------------------------------------------- Q. Two ropes are attached to a 40kg object. The 1st rope applies a force of 25N & 2nd rope applies force of 40N. If the ropes are perpendicular to each other, what is the resultant...