How many moles of NaNO3 are needed to produce 49.7 grams of Na2S if the molar mass of Na2S is 78.05 g/mol?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)

Write balanced nuclear equations for the formation of five elements whose atomic number is between helium (2) and iron (26):