If there are 20.0g of KOH available, how many grams Ca(OH)2 will form? I got a weird answer, so can someone explain?

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer