Please Help! :) Calcium carbonate decomposes to form carbon dioxide and calcium oxide:

CaCO3(s) > CO2(g) + CaO(s)

How many grams of calcium carbonate will be needed to form 3.45 liters of carbon dioxide at 740 mm Hg and 121 °C?

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?