Given that: S(s) + O2(g) --> SO2(g); ΔH = -148.4 kJ/mol 2 SO3(g) --> 2 SO2(g) + O2(g); ΔH = +197.8 kJ/mol Determine the enthalpy change of the reaction: 2 S(s) + 3 O2(g) --> 2 SO3(g)

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong