91. Lead(II) oxide is obtained by roasting galena, lead() sulfide, in air. The unbalanced equation is:

PLS(s) + 0,(g) PbO(s) + SO,(g)

a. Balance the equation, and determine the

theoretical yield of PbO if 200. 0 g of PbS is

heated

b. What is the percent yield if 170. 0 g of PbO is

obtained?

An electron is ejected into a horizontal uniform e⃗ field at a parallel horizontal velocity of v0. assume the electron's initial position x0, initial velocity v0, time t, magnitude of electric field e, electron's mass m, and the magnitude of the electron's charge |e|. ignore the force that earth exerts on the electron. assume the e⃗ field is in the same direction as the initial velocity. part a define the equation for the electron's velocity. express your answer in terms of the variables v0, |e|, t, e, and m.