1-Witch compound is composed of the most atoms? A- H25O4. B-Li2N.
C-Mg(OH)2. D-NaF.

2-Witch compound has the most hydrogen atoms?

A-NaOH. B-C2H4O.
C-H3PO4. D-(NH3)2SO4.

3-Witch compound has the greatest molar más?

A-H2O. B-C6H12O6.
C-HNO3. D-C2H6.

4-What is the molar mass for Ca(C2H3O2)2?

A-71g. B-99g.
C-158g. D-148g

5-show work for #4.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.