3/18/2018 oWLv2 I Online teaching and learning resource from Cengage Learning Ex

Question

3/18/2018 oWLv2 I Online teaching and learning resource from Cengage Learning Extra credit # 6 Question 1 jRefurences 1 pt CHEMWORK Question Question 3 Question 4 Question 5 Question 6 isited the number of moles for each compound. (Enter your answer to four significant figures.) 1 pt 1 pt 1 pt 1 pt Compound magnesium phosphate Mass Moles 330.5 g potassium chromate dinitrogen pentoxide 410.5 g 366.4 g 3/18/2018 OWLv21 Online deaching and learning resource from Cengage Learning Extra credit # 6 Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 CHEMWORK Pato 1 pt 1 pt 1 pt 1 pt 1 pt 1 pt Determine the molar mass for the following compounds. (Enter your answer to four significant figures.) Compound iron(III) chloride silver carbonate acetic acid aluminum sulfate potassium bromide g/mol g/mol g/mol g/mo g/mol SubmitShow Hints

Explanation / Answer

The no.of moles of a substance, given in grams per mole is the mass of a substance expressed in terms of its molar mass to facilitate calculation of equivalents in chemical reactions. No.of moles of compound is given as Mass of substance/Molar mass of substance.

Molar mass of magnesium phosphate is 262.855g/mol giving the no.of moles in 330.5g as 330.5/262.855 = 1.2573mol.

Molar mass of calcium nitrate is 164.088g/mol giving the no.of moles in 277.5g as 277.5/164.088 = 1.6911mol.

Molar mass of potassium chromate is 194.1896g/mol giving the no.of moles in 410.5g as 410.5/194.1896 = 2.1139mol.

Molar mass of dinitrogen pentoxide is 108.01g/mol giving the no.of moles in 366.4g as 366.4/108.01 = 3.3923mol.

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