Consider the combustion reaction,
2c4h2+5o > 4 co2+2h2o
where c2 h2 hf = 227.4 kj/mol), co2 (hf = –393.5 kj/mol), and h2 o (hf = –241.82 kj/mol). what is the enthalpy of the reaction?

–2,512.4 kj
–1,256.2 kj
1,256.2 kj
2,512.4 kj

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.