Question

practice 3.2
part i: mole weight - determine the mole weight of the following compounds.

1. $na_{2}so_{4}$ 14207g/mol

2 $becl_{2}$ 79.91 g/mol

1. $fe_{3}(po_{4})_{2}$
2. $cuno_{3}$
3. $sio_{2}$

Explanation:

Step1: <Find atomic weights>

Atomic weights: \(Na = 22.99\ g/mol\), \(S=32.07\ g/mol\), \(O = 16.00\ g/mol\), \(Be = 9.01\ g/mol\), \(Cl = 35.45\ g/mol\), \(Fe = 55.85\ g/mol\), \(P = 30.97\ g/mol\), \(Cu = 63.55\ g/mol\), \(N = 14.01\ g/mol\), \(Si = 28.09\ g/mol\)

Step2: <Calculate for \(Fe_3(PO_4)_2\)>

$$
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Step3: <Calculate for \(CuNO_3\)>

$$63.55+14.01+3\times16.00=63.55 + 14.01+48.00 = 125.56\ g/mol$$

Step4: <Calculate for \(SiO_2\)>

$$28.09+2\times16.00=28.09 + 32.00=60.09\ g/mol$$

Answer:

1. \(142.07\ g/mol\)
2. \(79.91\ g/mol\)
3. \(357.49\ g/mol\)
4. \(125.56\ g/mol\)
5. \(60.09\ g/mol\)