15 pts ! which chemical equation below does not illustrate the law of conservation of mass? al4c3 + 3h2o yields ch4 + 4al(oh)3 2 nacl + cao yields na2o + cacl2 3 lioh + fe(no3)3 yields 3lino3 + fe(oh)3 zn + 2hcl yields zncl2 + h2

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m

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.