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i need help with solvig these problems because i am not sure how to, i need it to be step by step

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Apr 6th, 2015

1.)The ratiois a relationship between two numbers of the same kind

2.)The molar ratios identify how many moles of product are formed from a certain amount of reactant, as well as the number ofmoles of a reactant needed to completely react with a certain amount of another reactant.

3.)The mole is a unit to express amounts of a chemical substance, defined as the amount of any substance that contains as many elementary things like atoms or molecules as there are atoms in 12 g of pure carbon-12 (12C), the isotope of carbon with atomic mass of 12 .

4 atoms in 2 mole of hydrogen

4.)338 g for one mole

for 0.482 g=0.482/338


5.)1 mole has 149 g

0.874 moles=130.2g

6.)6.023*10^23 molecules of NaCl constitutes one mole

0.45*10^12 molecules =7.478*10^(-13) moles

7.)from the given reaction 4 moles of ammonia form 6 moles of water 

0.9 moles of ammonia form=1.35 moles of water.

8)3 moles of calcium hydroxide gives 2 moles of aluminium hydroxide

0.087 moles of calcium hydroxide = 0.087*2/3=0.058 moles

1 mole weights 78 g

0.058 moles weighs=4.524 g

9.) 338 g of I2O5 gives 5*44 g of carbon dioxide

456.8 g produces=

456.8*5*44/338=297.32 g of CO2

44g of CO2 is one mole=6.023*10^23 molecules

297.32g is 4.0699*10^24 molecules

Apr 6th, 2015

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