Given CH2(g) + 2O2(g) - CO2(g) + 2H2O(1) AH° = -890.4 kJ, the standard enthalpy of
formation of CO2(g) = -393.5 kJ/mol, and the standard enthalpy of formation of H20(1) =
-285.9 kJ/mol,

calculate the standard enthalpy of formation of CH4(g).

A. +74.9 kJ
B. -74.9 kJ
C. -149.8 kJ
D. +149.8 kJ

The msds for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. it reacts with bases, various metals, and strong oxidizing agents. its vapors can form explosive mixtures with air.

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet

2ki + pb(no3)2 → 2kno3 + pbi2 determine how many moles of kno3 are created if 0.03 moles of ki are completely consumed.