Recent content by Nano

Do I convert .395 g to moles water to find the moles water (since all of the mass gained is water)?

.052105 mol water .00521 mol hydrate 1.89059 g hydrate

I saw the mistake after I posted it and converted the moles hydrate to g, but the resulting mass was greater that 1.678 (giving a percentage greater than 100) Basically what I have to do is find g hydrate (Na2SO4*10H2O) / 1.678 g mixture and multiply that by 100 to get ther percentage by mass...

I found the moles hydrate in the .11813 mol H2O by dividing it by 10 mol h2o per mol hydrate. Then I divided that by the 1.678 g hydrate mixture (1.283 +.395 g gained) to find the percentage mass. But that was not right either

Homework Statement A thoroughly dried 1.283 sample of Na2SO4 is exposed to the atmosphere and found to gain 0.395 in mass. What is the percent, by mass, of Na2SO4 * 10H20 in the resulting mixture of anhydrous and the decahydrate? Homework Equations 1 mol Na2SO4 = 142.0428 g 1 mol H20...

Homework Statement A technique once used by geologists to measure the density of a mineral is to mix two dense liquids in such proportions that the mineral grains just float. When a sample of the mixture in which the mineral calcite just floats is put in a special density bottle, the weight is...

440 * (1.6e-19)/ (9.11e-31) = 7.2777e13 m/s^2 I'm submitting it into an electronic homework service, which is very picky. I tried submitting a negative answer too, but that's is not correct either...

Homework Statement An electron has an initial velocity of 5 × 105 m/s in the x direction. It enters a uni- form electric field ~E = (440 N/C) ˆj which is in the y direction. The charge and mass of an electron are 1.6×10−19 C and 9.11×10−31 kg, respectively. Find the acceleration of the...

thanks, that was really helpful!

DNA getting smaller everytime it replicates?? Today in biology class, my teacher said that DNA gets smaller everytime it replicates. He also said that this is the main cause of aging (he said that the "shortening" of DNA ending up chopping off important genes later in life, which led to an...

http://cdn-write.demandstudios.com/upload//0000/600/30/8/50638.jpg http://teachingphysics.files.wordpress.com/2008/06/finished-motor.jpg Here are some pictures I found that show basically what I am trying to do. The problem is that the loop doesn't always spin consistently every time I place it...

it works with a large magnet, but not with a small one. What do I have to change so that it works with the small one?

i'm using sandpaper take off the insulation on half of the wire on one side, and all the insulation off on the other side; doesn't this work as a commutator?

Well, sometimes it spins and sometimes it doesn't! I don't really know what's going on... If it spins for too long, does it drain the battery?