Answers (1)
Get into your text and learn what a mole is. It is a basic measurement in chemistry and everybody will assume that you know it perfectly. You do have a printed periodic table, right? You can get the information at www.chemicalelements.com/index.html but you really need your own printed copy to carry with you. It will be a primary reference for everything you do. There is a diagonal line, B-C, Si-P, Ge-As, Sb-Te, and Po-At. Elements to the left of the line are metals, meaning they lose an electron easily, elements to the right of the line are non-metals, and elements on the line are semiconductors.
Zinc has molecular mass 65.39 so a mole of zinc weighs 65.39 grams. Zn(OH)2 tells you that one mole of zinc + two moles of hydroxide produces one mole of zinc hydroxide.
Zn(OH)2
Zinc 65.39
0 15.9994 x 2 = 31.9988
H 1.00794 x 2 =2.01588
---------------- ADD
99.40468
So the ratio of zinc to zinc hydroxide is 65.39/99.40468 which reduces to 0.65781611.
9.65 g v 0.65781611 = 6.34792547 grams
Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8" is going to be 7/16". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.
Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.