Penicillin is hydrolyzed and thereby rendered inactive by penicillinase, an enzyme present in some resistant bacteria. the mass of this enzyme in staphylococcus aureus is 29.6 kd. the amount of penicillin hydrolyzed in 1 minute in a 10-ml solution containing 10^-9 g of purified penicillinase was measured as a function of the concentration of penicillin. a plot of 1/v_0 versus 1/[s] indicated the v_max=6.8 times^- 10 mol minute^-1. assuming one active site per enzyme molecule, the turnover number for penicillinase is

(a) 337 s^-1
(b) 337 min^-1
(c) 600 hour^-1
(d) 33 hour^-1 600 s^-1

The turnover number is the maximum substrate quantitiy converted to product per enzyme and per second. It can be calculate as follows:

with active enzyme concentration.

In this case we have Vmax an data to calculate

Now

it is not like any option.

If we assume that have the non usual units of and it is

So we need divide by the moles of E (in place of [E])

Now

(pass from to dividing by 60)

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.