In the reaction 2AgI + Na2S → Ag2S +2NaI, how many moles Ag2S will be formed if 85.0 g Na2S is used? How many grams of As are needed to form 0.380 moles Na3AsO3 in the reaction 2As + 6NaOH → 2Na3AsO3 + 3H2?

8.5gNaI × 1molNaI/78gNaI × 234.7g AgI / 1 MOL AgI × 2Mol Ag I / 1mol Na2S=51.2 g of AgI reacts with Na2 S

How many grams NaOH will be needed to form 0.380 moles Na3AsO3 in the reaction 2As + 6NaOH → 2Na3AsO3 + 3H2?

In the reaction 2AgI + Na2S → Ag2S +2NaI, how many moles Ag2S will be formed if 85.0 g Na2S is used?

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.