Chem ge 問題...

Question

我想問ammonia , water vapour ,helium,nitrogen monoxide 的chemical formula 係咩???

仲有 1.6 g of sulphur are burnt completely in air to form sulphur dioxide. What volume of sulphur dioxide, measured at room temperature and pressure , is formed???

(請step by step, 唔該晒!!)

更新:

唔該晒你先!!!

但我想問ammonia NH3, 咁NH4 係咩????

仲有...An oxide of element X has the formula X2O3(Iron 3 oxide) . 10.2 g of this oxide contains 5.4 g of X. What is the relative atomic mass of X?

(relative atomic mass:O=16)

Answer 1

最愛解答

Ammonia – NH3 (g)

Water vapour – H2O (g)

Helium – He (g)

Nitrogen monoxide – NO (g)

Chemical equation:

S (s) + O2 (g) → SO2 (g)

Mole ratio of S : SO2 = 1 : 1

No. of mole of S

= Mass / molar mass

= 1.6 / 32.0

= 0.05 mol

So, no. of mole of SO2

= 0.05 mol

Volume of SO2 produced

= no. of mole X molar volume

= 0.05 X 24

= 1.2 dm3

2007-12-30 11:48:06 補充：

NH4是無的，但有NH4+，這是ammonium ion.Mole ratio of X : O = 2 : 3no. of mole of O = (10.2 - 5.4) / 16.0 = 0.3 molSo, no. of mole of X = 0.2 molRelative atomic mass of X= molar mass= mass / no. of mole= 5.4 / 0.2= 27.0

資料來源： Myself~~~