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Post by Doc Thot on Aug 1, 2011 17:19:18 GMT -5
The overall cell reaction occuring in an alkaline battery is? Zn(s) + MnO2(s) + H2O(l) ----> ZnO(s) + Mn(OH)2 (s)
a) How many moles of electrons flow per mole of reaction?
b) If 1.95g of zinc is oxidized, how many grams of manganese dioxide and of water are consumed? Grams of MnO2= ? Grams of H2O= ?
c) What is the total mass of reactants consumed in part(b)?
d) How many coulombs are produced in part (b)? 5 months ago Report Abuse by Anon E. Moose アナンイムース Member since: March 16, 2010 Total points: 27,611 (Level 7) Badge Image: Contributing In: Mathematics Add Contact Block Best Answer - Chosen by Asker a) Net Ionic Equation: Zn^[0] + Mn^[4+] → Zn^[2+] + Mn^[2+] Therefore, 2 mol e- are exchanged for every 1 mol reaction.
b) Look up the molar masses. mass MnO₂ = 1.95g/(molar mass zinc) * (molar mass MnO₂) mass H₂O = 1.95g/(molar mass zinc) * (molar mass H₂O)
c) mass_total = (mass Zn) + (mass MnO₂) + (mass H₂O)
d) 1.60217653∙10^(-19) * 2 * (number of moles) 5 months ago Report Abuse Asker's Rating: Asker's Comment: thank you so much for your help. however, for part (d), what should i put in for the number of moles? is it 2? or wht? i put in 2, but it is still wrong.
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Post by Deleted on Aug 1, 2011 17:54:56 GMT -5
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Post by Valentin on Aug 1, 2011 18:43:12 GMT -5
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Post by Doc Thot on Aug 1, 2011 18:46:53 GMT -5
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Post by Deleted on Aug 1, 2011 19:28:00 GMT -5
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Post by Doc Thot on Aug 1, 2011 19:49:13 GMT -5
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Post by Deleted on Aug 1, 2011 20:40:04 GMT -5
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Post by Doc Thot on Aug 1, 2011 22:04:02 GMT -5
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Post by Valentin on Aug 5, 2011 12:06:22 GMT -5
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Post by Deleted on Aug 5, 2011 15:37:03 GMT -5
Username: Myff Nickname: Myth Email: bored_before_i_began@yahoo.com AIM: htyM A MSN: chazlpfriend@hotmail.com Skype: Kaiser Myth Website: disco.fapetz.com {Closed} Wajas: Myth/25828
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Post by Scruffy on Aug 5, 2011 15:52:17 GMT -5
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Post by Doc Thot on Aug 5, 2011 18:24:35 GMT -5
Hee hee hee! The ray is fired at Brokan...
... and he gains 3 movement points!!!!
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Post by Scruffy on Aug 5, 2011 19:51:41 GMT -5
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Post by Valentin on Aug 5, 2011 20:22:01 GMT -5
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Post by Deleted on Aug 5, 2011 21:49:30 GMT -5
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