eq is : Na2CO3 + H2SO4 = Na2SO4 + CO2 + H2O
a. 3.18 x 10^5
b. 19.9
c. 35.3
d. 153
a. 3.18 x 10^5
b. 19.9
c. 35.3
d. 153
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i'm not going to do this for you, you won't learn, and it won't count for ANYTHING because you won't be able to get it in an exam, and that's the ONLY place it matters, it doesn't matter if you get every single answer riught, or every one wrong in your homeworks, trust me.
so.
every molecule of sodium carbonate (Na2CO3) you have, reacts with ONE molecule of sulphuric acid (H2SO4). you can tell this, because there are no balancing number in front of the chemicals.
one mole of a subtance contains 6.022X10 to the power of 23 molecules. it's a constant. so one mole of sodium carbonate, will react with one mole of sulphuric acid. if you can work out how many moles of one of the substances you have, you know how many molecules you have. to work out how many moles of H2SO4 you have, you multiply the VOLUME of the substance, by it's CONCENTRATION. but remember that volume needs to be in decimetres cubed (dm3) to work out right. one dm3 = 1000cm3, so 1dm3 = one litre. one cm3 of water is one millilitre, so it's 750cm3, which is three quarters of a litre, so 0.75dm3.
moles of H2SO4 = 0.75 X 0.25
know you know how many moles of H2SO4 you have, each one of those molecules will react with one molecule of Na2CO3, so the two substances will react in equal amounts. the number of moles of H2SO4 you get, will be the moles of Na2CO3 that react. you're asked for a mass, and each of the sodium carbonate atoms weighs exactly the same, so if you multiply the number of molecules you need, by the weight of each of those molecules, you know how much of the Na2CO3 you need.
the equation you need is moles = mass divided by RAM
i remember that equation, by imaging the animal a mole, and a sheep (a male sheep is called a RAM) standing side by side, holding up a dumb bell, (a mass) swap the animals for what they stand for, and you get the equation. or you could just rhyme off moles equals mass over RAM lol
anyway, you need mass, so rearrange the equation, to give you mass = RAM X moles
RAM of Na2CO3 multiplied by the number of moles you found out, equals YOUR ANSWER =]
learning this will pay off, i hope you understood what i wrote, and let me know how you got on, assuming it didn't take me so long to write this that you already left the question out and went to bed... =]
so.
every molecule of sodium carbonate (Na2CO3) you have, reacts with ONE molecule of sulphuric acid (H2SO4). you can tell this, because there are no balancing number in front of the chemicals.
one mole of a subtance contains 6.022X10 to the power of 23 molecules. it's a constant. so one mole of sodium carbonate, will react with one mole of sulphuric acid. if you can work out how many moles of one of the substances you have, you know how many molecules you have. to work out how many moles of H2SO4 you have, you multiply the VOLUME of the substance, by it's CONCENTRATION. but remember that volume needs to be in decimetres cubed (dm3) to work out right. one dm3 = 1000cm3, so 1dm3 = one litre. one cm3 of water is one millilitre, so it's 750cm3, which is three quarters of a litre, so 0.75dm3.
moles of H2SO4 = 0.75 X 0.25
know you know how many moles of H2SO4 you have, each one of those molecules will react with one molecule of Na2CO3, so the two substances will react in equal amounts. the number of moles of H2SO4 you get, will be the moles of Na2CO3 that react. you're asked for a mass, and each of the sodium carbonate atoms weighs exactly the same, so if you multiply the number of molecules you need, by the weight of each of those molecules, you know how much of the Na2CO3 you need.
the equation you need is moles = mass divided by RAM
i remember that equation, by imaging the animal a mole, and a sheep (a male sheep is called a RAM) standing side by side, holding up a dumb bell, (a mass) swap the animals for what they stand for, and you get the equation. or you could just rhyme off moles equals mass over RAM lol
anyway, you need mass, so rearrange the equation, to give you mass = RAM X moles
RAM of Na2CO3 multiplied by the number of moles you found out, equals YOUR ANSWER =]
learning this will pay off, i hope you understood what i wrote, and let me know how you got on, assuming it didn't take me so long to write this that you already left the question out and went to bed... =]