What is the atom economy for making calcium oxide by heating calcium carbonate: $CaCO_{3} \to CaO + CO_{2}$ ? ( $M_{r}$ : $CaCO_{3} = 100$ , $CaO = 56$ , $CO_{2} = 44$ .)

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What mass of calcium carbonate, $CaCO_{3}$ , is $0.25$ mol? ( $A_{r}$ : Ca $= 40$ , C $= 12$ , O $= 16$ .)
$5.85 g$ of sodium chloride ( $M_{r} = 58.5$ ) is dissolved to make $500 cm^{3}$ of solution. What is the concentration?
A compound contains $40.0%$ carbon, $6.7%$ hydrogen and $53.3%$ oxygen by mass. What is its empirical formula? ( $A_{r}$ : C $= 12$ , H $= 1$ , O…
What is the percentage by mass of nitrogen in ammonium sulfate, $(NH_{4})_{2} SO_{4}$ ? ( $A_{r}$ : N $= 14$ , H $= 1$ , S $= 32$ , O $= 16$ .)
$20 cm^{3}$ of methane burns completely in oxygen: $CH_{4} + 2 O_{2} \to CO_{2} + 2 H_{2} O$ (steam). What vo…
How many chloride ions are in $25 cm^{3}$ of $0.50 mol/dm^{3}$ calcium chloride solution? (Avogadro constant…