ضايع في الكيمياء .. !!

[AlKhAyYaL]

جايبلكم كم سؤال .. اللي يقدر يفيدنا ...
1- the international prototype of the kilogram in a cylinder made from an alley that is 90% platinum and 10% iridum .how many moles of PT are in the cylinder ... ?????

2-The weight of CR required to react with 5g S according to the equation 2S+2CR====>>CR2S3 ????


4- what mass of AgI can be made by the reaction of 10g of AgNo3 with 10g of NaI
AgNo3+I====>>> AgI ???

5 - How many grams of SF4 can theoretically be prepared from 6g scl2 and 3.5g of NaF
3scl2+4NaF====>> sF4+s2cl2+4Nacl .. ؟؟

... ياريت اللي يعرف يجاوب بالمختصر المفيد .. او اذا مو فايق يحلها بس يقولنا الطريقة .. مو لازم بالارقام ..
وشكرا مقدما ................. :)