What number of moles of o2 are needed to produce 14.2 grams of p4o10 from p? (molecular weight p4o10 = 284) (a) 0.0500 mole (b) 0.0625 mole (c) 0.125 mole (d) 0.250 mole (e) 0.500 mole

(D) 0.250 mole

Explanation:

From molecular weight we know that 1 mole of P4O10 wights 284 grams. So

In order to form 1 mole of P4O10 it is necessary 5 moles of O2,  so that the number of oxygen atoms are the same.

Knowing that 0.05 moles of P4O10 is formed we need 5 x 0.05 = 0.25 moles of O2

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.