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Easy Mole questions (SHOW CALCULATIONS CLEARLY)

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1- How many items are in 1.00 moles of Carbon?

2- How many grams of carbon are in 1.50 moles of Carbon?

3- How many moles of Hydrogen gas are in 5.04 grams of Hydrogen gas?

4- How many molecules of Carbon Dioxide (CO2) are in 88 grams of CO2

Oct 16th, 2017

1)  6.023 x10^23 atoms. 

1 mole of anything is 6.023 x10^23 units.

2) 1 mole of Carbon = 12 grams

1.5 mole = 1.5 x 12 = 18 grams

3) 5.04 grams hydrogen gas (1 mole H2/2.016 grams) 

= 2.5 moles hydrogen gas 

4) Atomic mass of CO2 = 12 + 32 = 44

88 grams is 2 mole of CO2.

1 Mole = 6.023 x10^23 molecules

2 Mole = 12.046 x10^23 molecules


Mar 19th, 2015

This is great!

But can you please elaborate further on question 3?

Much appreciated!

Mar 19th, 2015

Sure....give me 5 min.


Mar 19th, 2015

5.04 grams hydrogen gas

Hydrogen gas = H2 Whose atomic mass = 2.016 g

{ As, the atomic mass of H = 1.008 g }

1 mole H2 = 2.016 grams

 x mole of hydrogen = 5.04 grams

By unitary method:

1/x = 2.016/5.04

x = 5.04 / 2.016 = 2.5 moles

Hence, 2.5 moles hydrogen gas is the answer.

Dont forget to best the solution !!

For any more questions always remember, one tutor is always with you !!!!!!!!!

Mar 19th, 2015

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