Many enzymes are inhibited irreversibly by heavy metal ions such as Hg2+ , Cu2+ , or Ag+ , which can react with essential sulfhydryl groups to form mercaptides. Enz−SH+Ag+⟶Enz−S−Ag+H+ The affinity of Ag+ for sulfhydryl groups is so great that Ag+ can be used to titrate −SH groups quantitatively. To 10.0 mL of a solution containing 3.4 mg/mL of a pure enzyme, an investigator added just enough AgNO3 to completely inactivate the enzyme. A total of 0.134 μmol AgNO3 was required. Calculate the minimum molecular weight (r) of the enzyme.

Explanation:

one mole of AgNO₃ reacts to inactivate one mole of enzyme

mg of enzyme in 10 mL = 3.4 x 10 mg = 34 mg .

required AgNO₃ = .134 x 10⁻⁶ mole

.134 x 10⁻⁶ mole AgNO₃ is required for inactivating 34 mg of enzyme

1 mole of AgNO₃ will be  required for inactivating 34 / (.134 x 10⁻⁶ ) mg of enzyme

= 253.73 x 10⁶ mg of enzyme

= 253.73 x 10³ g of enzyme

Mol weight of enzyme =  253.73 x 10³ .

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.