in the balanced chemical reaction for the combustion of acetylene (used in welding torches), determine at standard temperature and pressure, how many liters of CO2 gas are produced if 10 liters of Oxygen gas are completely consumed?

_2_C2H2 + _5_ O2 --> _4_CO2 + _2_ H2O

please help thx

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community