An analysis if a pyrex glass …

<div>$\mathrm{Consider} 100 g \mathrm{of} \mathrm{glass }$
So, mass of SiO2=100-(12.9+2.2+3.8+0.4)=80. 7 g
mass of B2O3= 12.9 g
Mass of 1 mole of SiO2 i.e. molar mass of SiO2=28+16×2=60 g
Now, 60 g of SiO2 contains 1 mol of Si atom
So, 80.7 g of SiO2 contains 160×80.7=1.345 mol of Si
Similarly, Molar mass of B2O3=2×10+3×16=68 g
Now, 68 g of B2O3 contains 2 mol of B atom
So, 12.9 g of B2O3 contains 268×12.9=0.379 mol of B
Ratio of Si:B = 1.345:0.379 </div> <script type="application/ld+json">{"@context":"http:\/\/schema.org","@type":"QAPage","text":"An analysis of pyrex glass showed 12 9 % B2O3, 2 2% Al2O3, 3 8%\nNa2O,0 4% K2O and remaining is SiO2 What is the ratio of silicon to\nboron atoms in the glass?","mainEntity":{"@context":"http:\/\/schema.org","@type":"Question","name":"An analysis of pyrex glass showed 12 9 % B2O3, 2 2% Al2O3, 3 8% Na2O,0 4% K2O and remaining - Chemistry - ","text":"An analysis of pyrex glass showed 12 9 % B2O3, 2 2% Al2O3, 3 8%\nNa2O,0 4% K2O and remaining is SiO2 What is the ratio of silicon to\nboron atoms in the glass?","dateCreated":"2016-05-10","about":"Chemistry","url":"https:\/\/www.meritnation.com\/ask-answer\/question\/an-analysis-of-pyrex-glass-showed-12-9-b2o3-2-2-al2o3-3-8-na\/chemistry\/10282511","author":{"@type":"Person","name":"Pritish Pal"},"answerCount":"1","acceptedAnswer":{"@context":"http:\/\/schema.org","@type":"Answer","text":"Dear Student,\n\nConsider\u00a0100\u00a0g\u00a0of\u00a0glassSo,\u00a0mass\u00a0of\u00a0SiO2=100-(12\n9+2 2+3 8+0 4)=80 \u00a07\u00a0gmass\u00a0of\u00a0B2O3=\u00a012\n9\u00a0gMass\u00a0of\u00a01\u00a0mole\u00a0of\u00a0SiO2\u00a0i e\n\u00a0molar\u00a0mass\u00a0of\u00a0SiO2=28+16\u00d72=60\u00a0gNow,\u00a060\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a01\u00a0mol\u00a0of\u00a0Si\u00a0atomSo,\u00a080\n7\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a0160\u00d780 7=1\n345\u00a0mol\u00a0of\u00a0SiSimilarly,\u00a0Molar\u00a0mass\u00a0of\u00a0B2O3=2\u00d710+3\u00d716=68\u00a0gNow,\u00a068\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a02\u00a0mol\u00a0of\u00a0B\u00a0atomSo,\u00a012\n9\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a0268\u00d712 9=0\n379\u00a0mol\u00a0of\u00a0BRatio\u00a0of\u00a0Si:B\u00a0=\u00a01\n345:0 379\u00a0","url":"https:\/\/www.meritnation.com\/ask-answer\/question\/an-analysis-of-pyrex-glass-showed-12-9-b2o3-2-2-al2o3-3-8-na\/chemistry\/10282511","upvoteCount":0,"author":{"@type":"Person","name":"Vartika Jain"},"dateCreated":"2016-05-10"}},"aggregateRating":{"@type":"AggregateRating","ratingValue":3.5,"ratingCount":10}}</script><script type="application/ld+json">{"@context":"http:\/\/schema.org","@type":"Answer","text":"Dear Student,\n\nConsider\u00a0100\u00a0g\u00a0of\u00a0glassSo,\u00a0mass\u00a0of\u00a0SiO2=100-(12\n9+2 2+3 8+0 4)=80 \u00a07\u00a0gmass\u00a0of\u00a0B2O3=\u00a012\n9\u00a0gMass\u00a0of\u00a01\u00a0mole\u00a0of\u00a0SiO2\u00a0i e\n\u00a0molar\u00a0mass\u00a0of\u00a0SiO2=28+16\u00d72=60\u00a0gNow,\u00a060\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a01\u00a0mol\u00a0of\u00a0Si\u00a0atomSo,\u00a080\n7\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a0160\u00d780 7=1\n345\u00a0mol\u00a0of\u00a0SiSimilarly,\u00a0Molar\u00a0mass\u00a0of\u00a0B2O3=2\u00d710+3\u00d716=68\u00a0gNow,\u00a068\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a02\u00a0mol\u00a0of\u00a0B\u00a0atomSo,\u00a012\n9\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a0268\u00d712 9=0\n379\u00a0mol\u00a0of\u00a0BRatio\u00a0of\u00a0Si:B\u00a0=\u00a01\n345:0 379\u00a0","url":"https:\/\/www.meritnation.com\/ask-answer\/question\/an-analysis-of-pyrex-glass-showed-12-9-b2o3-2-2-al2o3-3-8-na\/chemistry\/10282511","upvoteCount":0,"author":{"@type":"Person","name":"Vartika Jain"},"dateCreated":"2016-05-10"}</script>