(a) 2 41. A typical pyrex glass contains 12.9% of B,0, and 80.7% of Sio, (by weight) besides other oxides (AI,O, NaO, KO) what is the weight ratio of Silicon to Boron in the glass (Atomic weights Si = 28.1, B = 10.8) (a) 9.32:1 (b) 9.76:1 (c) 9.29: 1 (d) 9.43 : 1
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Answer:
Moles of B2O3 =12.9/70 = 0.184
Moles of B atoms=2x0.184 = 0.368
80.7 Moles of Si O₂ = = 1.345= moles of Si 60
atom
Therefore no. of atoms is directly proportional to no. of moles
no. of silicon atoms 1.345 no. of boron atoms 0.368
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option © 9.29 : 1 is the correct answer
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