Assuming that evaporation is negligible, how does the mass of a liquid change as the temperature increases? How does the volume of a liquid typically change as the temperature increases? How then do you expect the density of a typical liquid to change as the temperature increases?

how many moles of HCl gas should be dissolved in 1 litre of 0.1M NH4OH solution so that it results into buffer solution having pH=9.26?(Pkb of NH4OH is = 4.74)

5 NaClO2 + 4 HCl = 5 NaCl + 4 ClO2 + 2 H2O This is the equilibrium equation. But lets say I don't have 4 moles of HCI say I have .1 /mole/g of HCI how much of NACLO2 do I need to produce 250 milligrams of CIO2. I can not change the HCI has this is the amount of HCI found in the Stomach, so how...

Could you explain to me why I ended up with two marks out of a possible 6 in these questions? I think that I answered them correctly but I am not sure so I would like your help so that then I may tell my instructor.