PLEASE HELP!!! 1. How many moles of oxygen gas would be needed to react with 155 g of propane gas, C3Hg, in a combustion reaction? a C3H8 (g) + 502 (g) -> 3CO2 (g) + 4H20 (1)

2. How many grams of Nitrogen monoxide (NO) will be produced from 2.50 g oxygen (O2)?
4NH3 + 5O2 -> 4NO + 6H2O

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

What can be done to make a solid solute dissolve faster in a liquid solvent?