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Chapter 27: Q14P (page 767)

A 1.000-g sample of unknown gave 2.500 g of bis (dimethylglyoximate)nickel (II) (FM 288.91) when analyzed by Reaction 27-7. Find the weight percent of Ni in the unknown.

Short Answer

Expert verified

The weight percent of Ni is 0.5079.

Step by step solution

01

calculate the moles of bis (dimethylglyoximate)nickel (II):4

In this task we have a 1 g of sample which gave 2.5 g of bis (dimethylglyoximate)nickel(II) (M=288.91 g/mol) when analyzed by Reaction 27-7. Here we will find the weight percent of Ni in the unknown sample.

Calculate the moles of bis (dimethylglyoximate)nickel(II):

n=mMn=2.5g288.91g/moln=8.6532×10-8mol

consider that n (bis (dimethylglyoximate)nickel(II)) =n (Ni)

02

calculate mass and weight percent of Ni:

The mass of Ni is,

m(Ni)=n×Mm(Ni)=(8.6532×10-8mol)×58.6934g/mol

The weight percent of Ni is,

wt%=mNimsamplewt%=0.50788g1gwt%=0.5079

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Most popular questions from this chapter

Thermogravimetric analysis and propagation of error. 16 Crystals of deuteratedpotassium dihydrogen phosphate,K(DxH1-x)2PO4are used in optics as a light valve, as a light deflector, and for frequency doubling of lasers. The optical properties are sensitive to the fraction of deuterium in the material. A publication states that deuterium content can be determined by measuring the mass lost by dehydration of the crystal after slow heating to450°C in a Pt crucible underN2

(a) Letα be the mass of product divided by the mass of reactant:

α=massofKPO3massofK(DxH1-x)2PO4

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(c) From equation B.1 in Appendix B, show that the uncertainty inx(ex) is related to the uncertainty inα(eα)by the equation

ex=58.6670eαα2

(d) The uncertainty in deuterium: hydrogen stoichiometry ise_{x}The authors estimate that their uncertainty inα isex=0.0001. Fromeα computee_{x}. Write the stoichiometry in the formx±ex Ifexwere 0.001 (which is perfectly reasonable), what wouldexbe?

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