Number of moles

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Ben Brawn 9 years ago

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Question statement

Give any introductory information the student needs.

			Name	Type	Generated Value

chem	list	List of 3 items
test0	string	$\text{NaCl}$
test1	string	Na has an atomic mass of 23 an
mult	number	5
grams	number	290

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
random([
["$\\text{NaCl}$","Na has an atomic mass of 23 and Cl has an atomic mass of 35. Therefore the molecular mass of NaCl is $23+35=58$.",58],
["$\\text{KCl}$","The atomic mass of K is 39 and the atomic mass of Cl is 35. Therefore the molecular mass of KCl is $39+35=74$.",74],
["$\\mathrm{C_3H_5NaO_3}$","The atomic mass of C is 12, the atomic mass of H is 1, the atomic mass of Na is 23 and the atomic mass of O is 16. Therefore, the molecular mass of $\\mathrm{C_3H_5NaO_3}$ is $3\\times 12+5\\times 1 +23 +3\\times 16 = 112$.",112],
["$\\mathrm{CaCl_2.2H_2O}$", "The atomic mass of Ca is 40, the atomic mass of Cl is 35, the atomic mass of H is 1 and the atomic mass of O is 16. Therefore, the molecular mass of $\\mathrm{CaCl_2.2H_2O}$ is $40+2\\times 35 +2\\times(2\\times 1+16)=146$.",146],
["$\\mathrm{Ca_3PO_4}$", "The atomic mass of Ca is 40, the atomic mass of P is 31 and the atomic mass of O is 16. Therefore, the molecular mass of $\\mathrm{Ca_3PO_4}$ is $3\\times 40 + 31 + 4\\times 16=215$.",215],
["$\\mathrm{MgCl_2}$", "The atomic mass of Mg is 24 and the atomic mass of Cl is 35. Therefore, the molecular mass of $\\mathrm{MgCl_2}$ is $24+2\\times 35=94$.",94],
["$\\mathrm{Na_2HPO_4}$","The atomic mass of Na is 23, the atomic mass of H is 1, the atomic mass of P is 31 and the atomic mass of O is 16. Therefore, the molecular mass of $\\mathrm{Na_2HPO_4}$ is $2\\times 23+1+31+4\\times 16=142$.",142],
["$\\mathrm{Na_2SO_4}$", "The atomic mass of Na is 23, the atomic mass of S is 32 and the atomic mass of O is 16. Therefore, the molecular mass of $\\mathrm{Na_2SO_4}$ is $2\\times 23+32+4\\times 16=142$.",142],
["$\\mathrm{C_6H_{12}O_6}$","The atomic mass of C is 12, the atomic mass of H is 1, the atomic mass of O is 16. Therefore, the molecular mass of $\\mathrm{C_6H_{12}O_6}$ is $6\\times 12+12\\times 1+6\\times 16=180$.",180]])

JME function reference

Description

chem formula, sentence for molecular mass

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

Can an exam override the value of this variable?

Generated value: `list`

[ "$\\text{NaCl}$", "Na has an atomic mass of 23 and Cl has an atomic mass of 35. Therefore the molecular mass of NaCl is $23+35=58$.", 58 ]

→ Used by:

grams
test0
test1

"Part a)" - prompt
"Part a)" → "Unnamed gap" - Minimum accepted value
"Part a)" → "Unnamed gap" - Maximum accepted value
"Part a)" → "Unnamed step" - prompt
"Part b)" - prompt
"Part b)" → "Unnamed step" - prompt

Parts

Part a) Gap-fill
1. Gap Number entry
  Add
1. Step Information only
Part b) Gap-fill
1. Gap Number entry
  Add
1. Step Information only

Gap-fill

Ask the student a question, and give any hints about how they should answer this part.

The molecular weight of {chem[0]} is Unnamed gap g/mol (round each atomic weight to the nearest whole number for this exercise).

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Give a worked solution to the whole question.

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Part	Test	Passed?
Gap-fill
Gap-fill		Hasn't run yet
Number entry
Number entry		Hasn't run yet
Information only
Gap-fill
Gap-fill		Hasn't run yet
Number entry
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Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Ben Brawn 9 years ago

Ben Brawn 9 years, 1 month ago

Error in variable testing condition

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Warning

Generated value: `list`

Parts

Gap-fill

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Number of moles

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Ben Brawn 9 years ago

Ben Brawn 9 years, 1 month ago

Error in variable testing condition

Error

Warning

Generated value: list

Parts

Gap-fill

Generated value: `list`