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Standard XII

Chemistry

Atomic Number and Mass Number

An analysis o...

Question

An analysis of pyrex glass showed 12.9% $B_{2} O_{3}$ , 2.2% $A l_{2} O_{3}$ , 3.8% $N a_{2} O$ , 0.4% $K_{2} O$ and remaining is $S i O_{2}$ . What is the ratio of silicon to boron atoms in the glass?

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Solution

Moles of B $_{2} O_{3} = \frac{12.9}{70}$ =0.184
Moles of B atoms=2x0.184 = 0.368
Moles of Si O $_{2}$ = $\frac{80.7}{60}$ = 1.345 = moles of Si atom
Therefore no. of atoms is directly proportional to no. of moles
$\frac{n o . o f s i l i c o n a t o m s}{n o . o f b o r o n a t o m s}$ = $\frac{1.345}{0.368}$

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Similar questions

Q. An analysis of Pyrex glass showed the presence of 12.9% of

B_{2} O_{3}

, 2.2% of

A l_{2} O_{3}

, 3.8% of

N a_{2} O

, 0.4% of

K_{2} O

and the remaining was

S i O_{2}

. What is the ratio of silicon to boron atoms in the glass?

Q. An analysis of Pyrex glass showed the presence of 12.9% of

B_{2} O_{3}

, 2.2% of

A l_{2} O_{3}

, 3.8% of

N a_{2} O

, 0.4% of

K_{2} O

and the remaining was

S i O_{2}

. What is the ratio of silicon to boron atoms in the glass?

The constituents used in the manufacturing of different types of glasses are given below.

Silica( ${SiO}_{2}$ ), Sodium Carbonate ( ${Na}_{2} {CO}_{3}$ ), Calcium Carbonate ( ${CaCO}_{3}$ ), Potassium Carbonate( $K_{2} {CO}_{3}$ ), Boron Oxide ( $B_{2} O_{3}$ ), Alumina ( ${Al}_{2} O_{3}$ ) and Lead Oxide ( $PbO$ )

Choose the option/s that correctly matches the constituents and its use.

Q. In what solution do we dissolve boron oxide

(B_{2} O_{3})

and silica

(S i O_{2})

respectively to form borates and silicates?

Q. What is the chief constituent of Pyrex glass ?

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An analysis of pyrex glass showed 12.9% B2O3, 2.2% Al2O3, 3.8% Na2O, 0.4% K2O and remaining is SiO2. What is the ratio of silicon to boron atoms in the glass?

Moles of B2O3=12.970 =0.184Moles of B atoms=2x0.184 = 0.368Moles of Si O2 =80.760= 1.345 = moles of Si atomTherefore no. of atoms is directly proportional to no. of molesno. of silicon atomsno. of boron atoms =1.3450.368

An analysis of pyrex glass showed 12.9% $B_{2} O_{3}$ , 2.2% $A l_{2} O_{3}$ , 3.8% $N a_{2} O$ , 0.4% $K_{2} O$ and remaining is $S i O_{2}$ . What is the ratio of silicon to boron atoms in the glass?