Beat the mole

Can you save the day?

Click on an element for a clue

C

O

S

N

B

F

H

K

• You need to gain access to Colin's secret lab
• Find the clues by answering the tasks
• Once you have all the clues enter the password to Colin's secret lab and save the day!

Colin the mole has taken all the glassware from your lab!

Periodic table

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Atomic mass

Relative formula mass

Mole calculations

beat the mole!

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a73d36z1010

Percentage composition

To calculate the percentage composition of a particular element in a compound you first need the relative formula mass of the entire compound. Then divide the mass of the particular element by the total mass of the compound. For example to calculate the percentage composition of oxygen in CO2 first find the relative formula mass of the compound, 44. Then find the mass of oxygen in that compound. The atomic mass of oxygen is 16, there are 2 atoms of oxygen in the compound so the total mass of oxygen is: 16 + 16 =32 Finally divide 32 by 44 and multiply by 100; 32 / 44 x 100 = 72.73%

What is the mass of 3 moles of ethanol (C2H5OH)? The letter corresponding to the correct answer is the 4th digit of the code. a 87g b 15g c 276g d 138g e 86g

A sample of hydrated sodium carbonate, Na2CO3.xH2O, was heated to dryness and the water collected. 1.06g sodium carbonate remained and 1.8g water was collected. Determine x The answer makes up the 10th and 11th digits of the code.

How many moles of atoms are in 36g of carbon? The answer is the 3rd digit of the code.

What is the atomic mass of lithium? The answer is the 2nd digit of the code.

To find the atomic mass of an element you need a periodic table. Find the element, it will have 2 numbers. The smaller number is the atomic number (number of protons in the nucleus of that atom). The larger number is the atomic mass. For example the element Beryllium has an atomic number of 4 and an atomic mass of 9.

To find the relative formula mass of a compound, add up all the atomic mass numbers of each element present. For example carbon dioxide has the formula CO2. The atomic mass of carbon is 12, the atomic mass of oxygen is 16. There is 1 carbon atom and there are 2 oxygen atoms. So the relative formula mass of carbon dioxide is 12 + 16 + 16 = 44

The equation required for these questions is: mass = number of moles x relative formula mass This equation can be rearranged to give: number of moles = mass / relative formula mass

How many moles of sulfur atoms are there in 960g of sulfur? The letter corresponding to the answer is the 7th digit in the code u 0.3 v 0.03 w 60 x 0.17 y 0.6 z 30

Calculate the mass of magnesium oxide formed if 6g magnesium are burned completely in oxygen. The answer is the 8th and 9th digits of the code.

What is the relative formula mass of calcium sulfate CaSO4? The first digit of the code is the letter corresponding to the correct answer. a 136 b 88 c 44 d 68

What volume of gas would be occupied by 66g CO2 at room temperature and pressure? The answer (in dm3 makes up digits 5 and 6 of the code.

To calculate the percentage composition of a particular element in a compound you first need the relative formula mass of the entire compound. Then divide the mass of the particular element by the total mass of the compound. For example to calculate the percentage composition of oxygen in CO2 first find the relative formula mass of the compound, 44. Then find the mass of oxygen in that compound. The atomic mass of oxygen is 16, there are 2 atoms of oxygen in the compound so the total mass of oxygen is: 16 + 16 =32 Finally divide 32 by 44 and multiply by 100; 32 / 44 x 100 = 72.73%

I've got 6.022x1023 problems but glassware ain't one.

Congratulations chemist, you cracked my code!I am clearly no match for your magnificant mole calculation skills!

a73d36z1010