A sample of zinc metal was reacted with an excess of hydrochloric acid.
Zn(s) + 2HCl(aq) ==> ZnCl2(aq) + H2(g)
All of the zinc reacted, and the hydrogen gas was collected over water at 24C; the barometric pressure was 755 mmHg. The apparatus was similar to that shown in Figure 5.20, but the level of water inside the tube was 31.0 cm above the level outside the tube. If the volume of gas in the tube is 21.4 mL, how many grams of zinc were there in the sample? Do not enter unit. The density of Hg is 13.596 g/mL and the density of water is 1.000 g/mL.
2006-10-13 04:52:44 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Use gas laws to convert to volume at STP, use molar volume of gas at STP to get moles of H2, , stoichiometry says you will get the same moles of Zn as H2 so do the rest, prolly have to correct for solubility of h2 in water
2006-10-17 02:56:02 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Which Figure ????????????
2006-10-13 13:57:43 · answer #2 · answered by ag_iitkgp 7 · 0⤊ 0⤋