Which, if any, of the following aqueous mixtures would be a buffer system?Group of answer choicesH2CO3, HCO3–CH3COOH, NaH2PO4H2PO4–, HCO3–HSO4–, HSO3–None of these will be a buffer solution

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Word equation for k(s) +h2o(l) yield koh (aq) + h2

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