Stoichiometry!! CHEMISTRY

2009-03-28 5:07 am

Indium antimonide (InSb) detectors are used for thermal imaging, infrared detectors, and heat-seeking missile guidance systems. The antimony metal needed to make indium antimonide is usually found in nature as the mineral stibnite, Sb2S3. Pure antimony can be obtained by first converting the sulfide in stibnite to an oxide, and then heating the oxide with coke (carbon). It can then be converted to indium antimonide via a high temperature reaction with indium metal. The relevant reactions are:

2 Sb2S3 (s) + 9 O2 (g) Sb4O6 (s) + 6 SO2 (g)

Sb4O6 (s) + 6 C (s) 4 Sb (s) + 6 CO (g)

In (s) + Sb (s) InSb(s)

1)
How many kilograms of indium antimonide can be obtained from 400 kg of stibnite using this process?

2)
How many kilograms of indium metal are required for this reaction?

更新1:

unfortunately,,your answer is wrong... sorry

更新2:

can u help me again? i really cant fix that problem.. i would really appreciate it

回答 (2)

老爺子

2009-03-29 3:09 am

✔ 最佳答案

1)
The conversion can be summarize as the follows:
2Sb2S3 → Sb4O6 → 4Sb → 4InSb
Mole ratio Sb2S3 : InSb = 2 : 4 = 1 : 2

Molar mass of Sb2S3 = 121.8x2 + 32.1x3 = 339.9 g/mol
Molar mass of InSb = 114.8 + 121.8 = 236.6 g/mol

No. of moles of Sb2S3 used = (400 x 1000)/339.9 = 1.177 x 1000 mol
No. of moles of InSb formed = (1.177 x 1000) x 2 = 2.354 x 1000 mol
Mass of InSb obtained = (2.354 x 1000) x 236.6 = 557 x 1000 g = 557 kg

2.
In + Sb → InSb
Mole ratio In : Sb = 1 : 1

No. of moles of InSb formed = 2.354 x 1000 mol
No. of moles of In used = 2.354 x 1000 mol
Molar mass of In = 114.8 g/mol
Mass of In used = (2.354 x 1000) x 114.8 = 270.2 x 1000 g = 270.2 kg
=

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andrea

2009-03-29 5:43 am

can anyone help me please?thankyou

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