How many joules of energy are required to raise 14g of Iron from 20oC to 32oC, given the specific heat of Iron as 0.234J/goC?

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion