2017-02-16 17:41:41kfsdgte
CHEM F.4
標題:
CHEM F.4
發問:
1.A student tried to extract lead from lead(II) oxide.He placed 10.0g of lead(II) oxide and 10.0g of carbon powder in a crucible and heated the mixture with a Bunsen flame.bii)Suggest ONE observation for the reaction.Ci)Determine which reagent is in excess.cii)Calculate the maximum mass of lead that... 顯示更多 1.A student tried to extract lead from lead(II) oxide.He placed 10.0g of lead(II) oxide and 10.0g of carbon powder in a crucible and heated the mixture with a Bunsen flame. bii)Suggest ONE observation for the reaction. Ci)Determine which reagent is in excess. cii)Calculate the maximum mass of lead that could be obtained. In face,the student only obtained 7.10g of lead. di)Calculate the percentage yield of the reaction. dii)Suggest ONE reason why the student cannot get the maximum mass of lead.
最佳解答:
1.A student tried to extract lead from lead(II) oxide.He placed 10.0g of lead(II) oxide and 10.0g of carbon powder in a crucible and heated the mixture with a Bunsen flame. bii)Suggest ONE observation for the reaction. silvery solid is given out Ci)Determine which reagent is in excess. Consider the equation: 2 PbO + C → 2Pb + CO2 atomic mass of PbO = 207+16 = 223g/mol 10g PbO =10/223=0.045mol atomic mass of C = 12 10g C = 10/12 = 0.83 mol from the equation, mol of C : mol of PbO = 1:2 so only 0.022 mol C will react ∴C is the reagent in excess cii)Calculate the maximum mass of lead that could be obtained. because 10g PbO = 0.045 mol PbO so 0.045 mol Pb can be obtained 0.045 mol Pb =0.045*207=9.28 g In face,the student only obtained 7.10g of lead. di)Calculate the percentage yield of the reaction. 7.10/9.28*100%=76.5% dii)Suggest ONE reason why the student cannot get the maximum mass of lead. Only the lead oxide on the surface react with carbon. The lead oxide deep inside can not contact with cabon to carry out reaction.
CHEM F.4
發問:
1.A student tried to extract lead from lead(II) oxide.He placed 10.0g of lead(II) oxide and 10.0g of carbon powder in a crucible and heated the mixture with a Bunsen flame.bii)Suggest ONE observation for the reaction.Ci)Determine which reagent is in excess.cii)Calculate the maximum mass of lead that... 顯示更多 1.A student tried to extract lead from lead(II) oxide.He placed 10.0g of lead(II) oxide and 10.0g of carbon powder in a crucible and heated the mixture with a Bunsen flame. bii)Suggest ONE observation for the reaction. Ci)Determine which reagent is in excess. cii)Calculate the maximum mass of lead that could be obtained. In face,the student only obtained 7.10g of lead. di)Calculate the percentage yield of the reaction. dii)Suggest ONE reason why the student cannot get the maximum mass of lead.
最佳解答:
1.A student tried to extract lead from lead(II) oxide.He placed 10.0g of lead(II) oxide and 10.0g of carbon powder in a crucible and heated the mixture with a Bunsen flame. bii)Suggest ONE observation for the reaction. silvery solid is given out Ci)Determine which reagent is in excess. Consider the equation: 2 PbO + C → 2Pb + CO2 atomic mass of PbO = 207+16 = 223g/mol 10g PbO =10/223=0.045mol atomic mass of C = 12 10g C = 10/12 = 0.83 mol from the equation, mol of C : mol of PbO = 1:2 so only 0.022 mol C will react ∴C is the reagent in excess cii)Calculate the maximum mass of lead that could be obtained. because 10g PbO = 0.045 mol PbO so 0.045 mol Pb can be obtained 0.045 mol Pb =0.045*207=9.28 g In face,the student only obtained 7.10g of lead. di)Calculate the percentage yield of the reaction. 7.10/9.28*100%=76.5% dii)Suggest ONE reason why the student cannot get the maximum mass of lead. Only the lead oxide on the surface react with carbon. The lead oxide deep inside can not contact with cabon to carry out reaction.
- 急急急...( 請幫忙 ) 驅動程式
- 求救...有冇人幫到手...好絕望(20分)
- 中信銀行--!!
- 急!~搭113去胡中大廈點去-
- electrical ciruit problems
- 火影忍者總共有幾多集--
- 車頭燈問題
- 荃灣港安醫院
- 一隻股票的股價如何 定佢是否合理過高,比低估-yoki克請幫忙=.=thx
- 粉底、粉底液、粉餅、粉條、碎粉...到底點分？
此文章來自奇摩知識+如有不便請留言告知
其他解答:E2A5F59BAA12C031