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3 years ago

A 170.0 g sample of an unidentified compound contains 29.84 g sodium, 67.49

Chemistry

1 answer:

GREYUIT [131]3 years ago

6 0

The empirical formula : Na₂Cr₂O₇

<h3>Further explanation</h3>

Given

170 g sample contains :

29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen

Required

The compound's empirical formula

Solution

mol ratio of elements :

Na : 29.84 : 23 g/mol = 1.297

Cr : 67.49 : 51,9961 g/mol = 1.297

O : 72.67 : 16 g/mol = 4.54

Divide by 1.297

Na : Cr : O = 1 : 1 : 3.5 = 2 : 2 : 7

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5 g of gold and 25 g of silver are mixed to form a single-phase ideal solid solution. (a) how many moles of solution are there?

worty [1.4K]

Mole fraction for silver= 0.2317643/0.3079193

= 0.7526787

Mole fraction for gold=0.076155/0.3079193

=0.2473212

What is Molar Fraction?

The mole fraction is the product of the number of molecules of a specific component in a mixture and its total molecular weight. It serves as a means of indicating how concentrated a solution is.

It is a unit of concentration, defined as the product of the moles of a component and the moles of the entire solution. When all the parts of a solution are summed up, their mole fraction equals 1.

molar mass of silver = 107.8682g/mol

Molar mass of gold= 196.96657g/mol

Therefore mole = mass/molar mass

For silver: 25g/107.8682g/mol = 0.2317643mol

For gold: 15g/196.96657g/mol= 0.076155mol

Total number of mole= 0.2317643+0.076155

= 0.30791193mol

Mole fraction for silver= 0.2317643/0.3079193

= 0.7526787

Mole fraction for gold=0.076155/0.3079193

=0.2473212

Learn more about Mole Fraction from given link

brainly.com/question/28590918

#SPJ4

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