$1)$ Iron metal reacts with chlorine gas. How many grams of FeC$3$ are obtained when $515$ g C$2$

reacts with excess Fe: $2$ Fe $($s$)+3$ C$2($g$)----->2$ FeC$3($s$)$

$2)$ How many grams of Ag$2$CO$3$ are decomposed to yield $75\mathrm{.}1$ g Ag in this reaction:

Ag$2$CO$3($s$)----->$ Ag $($s$)+$ CO$2($g$)+$ O$2($g$)($not balanced$)$

$3)$ The reaction of calcium hydride with water can be used to prepare small quantities of hydrogen

gas, as is done to fill weather observation balloons.

CaH$2($s$)+$ H$2$O $($l$)----->$ Ca$($OH$)2($s$)+$ H$2($g$)($not balanced$)$

$($a$)$ How many grams of H$2($g$)$ result from the reaction of $127$ g CaH$2$ with an excess of water?

$($b$)$ How many grams of water are consumed in the reaction of $56\mathrm{.}2$ g CaH$2?$

$($c$)$ What mass of CaH$2($s$)$ must react with an excess of water to produce $8\mathrm{.}12$ x $1024$ molecules of H$2?$

$4)$ A piece of aluminum foil measuring $10\mathrm{.}25$ cm in length, $5\mathrm{.}50$ cm in width and $0\mathrm{.}601$ mm in height is

dissolved in excess HC $($aq$)$ as shown in the equation below. What mass of H$2($g$)$ can be produced?

D $=2\mathrm{.}70$ g cm$3$ for A$.$

$2$ A $($s$)+6$ HC $($aq$)----->2$ AlC$3($aq$)+3$ H$2($g$)$