How much heat energy is required to melt 40g of sodium chloride at its melting point

Imagine that twenty i.u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?