Consider the following combustion reaction: 2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O. 251 of C4H10 react with 155 g of O2 a) which substance is the limiting reactant? b) what mass of CO2 and H2O can be produced? Please help me...

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?