## Search found 4 matches

Thu Oct 12, 2017 11:24 pm
Forum: DeBroglie Equation
Topic: Ch.1 #41 [ENDORSED]
Replies: 6
Views: 663

### Ch.1 #41[ENDORSED]

We are asked to "find the velocity of a neutron of wavelength 100. pm" so we set the equation to v=h/mλ. So h=6.62608x10^-34, λ= 100 (given), and m=1.67493x10^-27 kg. My question is where did we get 'm' from? Is m a constant? Looking for clarification of where we get m=1.67493x10^-27 kg.
Thu Oct 12, 2017 11:18 pm
Forum: Einstein Equation
Topic: Chapter 1 #23
Replies: 6
Views: 598

### Chapter 1 #23

#23 is asking to "wavelength of the y-rays" and we're giving an energy of 140.511 keV. My question is why do we convert from eV to joules? Is it required to convert to joules in order to solve this problem?
Thu Oct 05, 2017 11:54 pm
Forum: Empirical & Molecular Formulas
Topic: F1
Replies: 3
Views: 400

### F1

Just need clarification on this problem, I understand that our mass percentage composition of C10H16O is 152.2264g. But I'm having a difficult time understanding why we divide 152.2264g to C, H, and O. ((ex) 120.1g x 100%/152.2264). Thanks!
Thu Oct 05, 2017 11:44 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: G17
Replies: 2
Views: 245

### G17

For part b, I get a mass of: 12.484 g of CuSO4 x 5H2O. However, after checking the solution manual I see that it is 12g instead. Ive tried calculating my work differently but I can't seem to get 12g...I always get 12.484. Is anyone else getting 12.484 g or am I making a rounding error?