Can you solve it? The hardness of the shell of the eggs can be determined by the amount of calcium carbonate CaCO3. The calcium carbonate reacts with hydrochloric acid 2HCL according to the following reaction:
CaCO3+ 2HCL ➡ CaCl2 + CO2 + H2O
- 0.412 grams of clean and dry eggshell is reacted with an excess of hydrochloric acid, obtaining 87 ml of CO2 measured at 20 °C and 750 mmHg.
1- determine the percentage of CaCO3 in the eggshell.
2- calculate the volume of 0.5M hydrochloric acid left over if 20 milliliters were added.
Data:
Mr(CaCO3)= 100
R= 0.082

Enzyme make a hormone as a catalyst

Answer; carbon monoxide (co);

Order of filling levels and sublevels of electrons: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²3f¹⁴5d¹⁰6p⁶for an element with 5 electrons in the 3d energy level: full configuration: 1s²2s²2p⁶3s²3p³.

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.