Calculate Number of Moles for a Given Empirical Mass and Atomic Mass

Error

There was an error loading the page.

Contributors

Feedback

From users who are members of MASH Bath: Question Bank :

Ruth Hand

said

Ready to use

2 years, 6 months ago

History

○

Christian Lawson-Perfect 2 years, 5 months ago

Published this.

○

Ruth Hand 2 years, 6 months ago

Gave some feedback: Ready to use

○

Daniel Miles 2 years, 7 months ago

Created this.

There is only one version of this question that you have access to.

There are 4 other versions that do you not have access to.

Question statement

Calculate the number of moles in {empirical_mass}g of {chemical_formula_compositions[chemical_formula_names[index]]["symbolic_form"]}.

The atomic masses are as given in the following table.

Symbol	m/z
{atomic_mass_dictionary[chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][0]]["symbol"]}	{atomic_mass_dictionary[chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][0]]["mass"]}
{atomic_mass_dictionary[chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][1]]["symbol"]}	{atomic_mass_dictionary[chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][1]]["mass"]}

Give any introductory information the student needs.

			Name	Type	Generated Value

index	integer	1
empirical_mass	integer	31
chemical_formula_names	list	List of 10 items
chemical_formula_compositions	dict	Dictionary with 10 entries
atomic_mass_dictionary	dict	Dictionary with 7 entries
round2ans	decimal	dec("0.91")
round1ans	decimal	dec("0.9")
atom_text	list	List of 42 items
moles	rational	31/34

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
random(0..9)

JME function reference

Description

Describe what this variable represents, and list any assumptions made about its value.

Can an exam override the value of this variable?

Generated value: `integer`

This variable doesn't seem to be used anywhere.

Advice

Recall that one mole of a substance, whose (average) atomic molecular mass is $X$ , has an empirical mass of $X$ g.

One molecule of {chemical_formula_compositions[chemical_formula_names[index]]["symbolic_form"]} contains {chemical_formula_compositions[chemical_formula_names[index]]["frequencies"][0]} {atom_text[chemical_formula_compositions[chemical_formula_names[index]]["frequencies"][0]]} of {chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][0]} and {chemical_formula_compositions[chemical_formula_names[index]]["frequencies"][1]} {atom_text[chemical_formula_compositions[chemical_formula_names[index]]["frequencies"][1]]} of {chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][1]}, thus, based upon the above table, we have an overall atomic molecular mass of {chemical_formula_compositions[chemical_formula_names[index]]["frequencies"][0]} × {atomic_mass_dictionary[chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][0]]["mass"]} + {chemical_formula_compositions[chemical_formula_names[index]]["frequencies"][1]} × {atomic_mass_dictionary[chemical_formula_compositions[chemical_formula_names[index]]["elements_involved"][1]]["mass"]} = {chemical_formula_compositions[chemical_formula_names[index]]["mass"]}.

Hence, one mole of {chemical_formula_compositions[chemical_formula_names[index]]["symbolic_form"]} weighs {chemical_formula_compositions[chemical_formula_names[index]]["mass"]}g.

Since we need {empirical_mass}g of {chemical_formula_compositions[chemical_formula_names[index]]["symbolic_form"]}, we take $\frac{\var{empirical_mass}}{\var{chemical_formula_compositions[chemical_formula_names[index]]["mass"]}}$ moles.
= {round2ans} moles (2 decimal places).

Give a worked solution to the whole question.

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Number entry
Number entry		Hasn't run yet
Number entry
Number entry		Hasn't run yet

This question is used in the following exams:

Chemistry W2 by Izabela Walczak in Chemistry.
Scientific calculations by Ruth Hand in MASH Bath: Moodle quizzes and TS.
Scientific Maths Training Space by Ruth Hand in MASH Bath: Moodle quizzes and TS.
Chemistry quiz by Yahya Saleh in Yahya's workspace.

Loading...

Error

Calculate Number of Moles for a Given Empirical Mass and Atomic Mass

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Christian Lawson-Perfect 2 years, 5 months ago

Ruth Hand 2 years, 6 months ago

Daniel Miles 2 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: `integer`

Parts

Number entry

Advanced settings

Loading...

Error

Calculate Number of Moles for a Given Empirical Mass and Atomic Mass

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Christian Lawson-Perfect 2 years, 5 months ago

Ruth Hand 2 years, 6 months ago

Daniel Miles 2 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Number entry

Advanced settings

Generated value: `integer`