12. If it takes 36.84ml of 0.02M KMnOs to titrate hydrogen peroide at in the ori
ID: 1034277 • Letter: 1
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12. If it takes 36.84ml of 0.02M KMnOs to titrate hydrogen peroide at in the original ide after it is diluted present 10 times with water, what is the amount in grams of H202 solution? a. 0.062grams b. 3.68 grams c, 0.625 grams d. 0.368grams 13. If the concentration of KMn04 is doubled in titration with H202, how does the balanced equation 5H2O2 + 2KMno. +3HS04-502 +2MnS04-K2SO4+8 HO change a. KMNO4 moles are reduced to half (2 to 1) b. H202 moles are doubled (5 to 10) c. Both happen d. Nothing changes in the equation 14. balance each of these equations: 15. The compound with highest melting point would be a. PCI3 b. NaCl c. CsH1206 d. AgNO3 16. Iron and sulfur react to form iron (II) sulfide. Write the reaction, balance the equation. Use the data below to calculate the percent composition of each element. mass of crucible mass of crucible and iron mass of crucible and iron (I1) sulfide 48.2 g 30.6g 41.8 gExplanation / Answer
13. d) nothing changes in the equation.
14. a) Mg3N2 + 6H2O = 3Mg(OH)2 + 2NH3
b) 2Cr(NO3)3 + 3H2S = Cr2S3 + 6HNO3
15. vant hoff factor for pcl3 is 4, so it will have highest melting point.
16. 8 Fe + S8 = 8 FeS
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