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?

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

a. vertically

explanation:

i tried it and took the test

if im wrong then we have different tests