There is no hydrogen in ammonium sulfide it is just 1 ammonium and 1 sulfer
Water displamement is effective because there is no way to get an exact and accurate measurement of an irregular solid because you can't measure curved line. Water displamement gives you a proper, exact, and accurate answer.
Total weight of alloy is
67 + 20 = 87 g
67 g of which is gold
So % gold is 67/87* 100 = 77.01%
1. Fossils, rocks and mountain range
2. The location of ancient climatic zones.
3. The continents have moves from the continental drift several lines of evidence
