问题 计算题

(3分)某化学活动小组用稀盐酸对赤铁矿中Fe2O3含量进行测定(杂质不与盐酸反应且不溶于水),得到一黄色残液。为防止直接排放造成环境污染,对其进行了处理,过滤该残液,取100 g 滤液,向其中不断加入某未知溶质质量分数的氢氧化钠溶液,所得

实验数据如下表:

加入氢氧化钠溶液的总质量/g20406080140160
生成沉淀的质量/g001.072.145.355.35
(资料:FeCl3 + 3NaOH = Fe(OH)3↓+ 3NaCl)

通过对上述实验数据的分析,选择合理的数据,计算所加氢氧化钠溶液中溶质的质量

分数。

答案

6%

题目分析:由题中数据可知:加入的氢氧化钠溶液的质量达到40g以前,都是氢氧化钠与滤液中的盐酸在反应,40g以后才是氢氧化钠与氯化铁反应,当生成沉淀的质量达到5.35g时,滤液中的物质已经不再发生反应,说明此时反应已经停止,故可以根据5.35g的数据来计算氢氧化钠的质量分数。次时加入的氢氧化钠溶液的总质量为:140-40=100g。

解:设与氯化铁反应的NaOH溶质的质量为x

FeCl3+3NaOH = Fe(OH)3↓+3NaCl

120      107

x      5.35g

120 / x =" 107" / 5.35g         

x=6g    

NaOH% = 6g  / (140g – 40g)×100%=" 6%"

答:略。

点评:分析题中数据,找到合适的数据带入计算是难点;根据化学方程式计算,要注意解题的步骤,设、写、找、列、解、答。

写句子
问答题


一、已知资料
1.销售合同书:
QINGDAO CLOTHING IMPORT & EXPORT CORPORATION
29, PINGAN ROAD QINGDAO, CHINA
TeL: 0086-532-84273456 S/C No. : PS09061517
Fax: 0086-532-84273457 Date: June 15, 2009
E-mail: JSC@163.com P/I No. : PF09051806

SALES CoNTRACT

TO:
ABC TRADING COMPANY
180 MOSQUE ROAD
CORAKANA, SRILANKA
Dear Sirs,
We hereby confirm having sold to you the following goods on terms and conditions as specified bellows:
MARKS & N0.DESCRIPTIONS 0F GOODSQUANTITYUNIT PRICEAMOUNT

ABC

CORAKANA

C/NO. 1-UP

COTT0N LADIES SKIRTS

STYLE NO. A101

STYLE N0. A102

200 DOZS

400 DOZS

CFR CORAKANA

USD 60.00/DOZ

USD 84.00/DOZ

USD 12000.00

USD 33600.00

TOTAL

600 DOZS

USD 45600.00


GOODS AS PER PROFORMA INVOICE NO. PF09051806 DATED MAY 18, 2009
LOADING PORT: QINGDAO
DESTINATION: CORAKANA
PARTIAL SHIPMENT: ALLOWED
TRANSSHIPMENT: NOT ALLOWED
PAYMENT: L/C AT SIGHT
THE BUYER: THE SELLER:
ABC TRADING COMPANY QINGDAO CLOTHING IMPORT & EXPORT CORPORATION
GEORGE BUSH 张三
2.信用证通知书:


3.信用证:

DOCUMENTARY CREDIT

SEQUENCE OF TOTAL *27: 1/1
FORM OF DOC. CREDIT *40A: IRREVOCABLE
DOC. CREKIT NUMBER *20: PL09070168
DATE OF ISSUE 31C: 090701
DATE AND PLACE OF EXPIRY *31D: DATE 090915 PLACE CHINA
APPLICANT *50: ABC TRADING COMPANY
180 MOSQUE ROAD
CORAKANA, SRILANKA
ISSUING BANK 52A: COLOMBO CENTRAL BANK OF SRILANKA
23, SPERD ROAD CORAKANA, SRILANKA
BENEFICIARY *59: QINCDAO CLOTHINGIMPORT & EXPORT COR-
PORATION29, PINGAN ROAD QINGDAO CHINA
AMOUNT *32B: CURRENCY USD AMOUNT 45600.00
AVAIIABLE WITH/BY *41D: BANK OF CHINA
BY NECOTLATION
DRAFrS AT 42C: AT SIGHT
DRAWEE 42A: COLOMB0 CENTRAL BANK OF SRILANKA
23, SPERD ROAD CORAKANA, SRILANKA
PARTIAL SHIPMENTS 43P: ALLOWED
TRANSSHIPMENT 43T: NOT ALLOWED
LOADING ON BOARD 44A: QINGDAO
FOR TRANSPORTATION NO. 44B: CORAKANA, SRILANKA
LATEST DATE OF SHIPMENT 44C: 90820
DESCRIPT OF GOODS 45A: COTTON LADIES SKIRTSAS PER PROFORMA
INVOICE NO. PF09051806 DATED MAY 18,
2009200 DOZS OF COTTON IJADIES SKIRTS.
STYLE NO. A101
EACH FOR 60 USD-TOTAL USD 12000.0D400
DOZS OF COTTON LADIES SKIRTS. STYLE
NO. A102
EACH FOR 84 USD-TOTAL USD33600.00
CFR CORAKANA
DOCUMENTS REQUIRED 46A: +SIGNED COMMERCIAL INVOICE, 1 ORIGI-
NAL AND 3 COPIES.
+PACKINC LIST. 1 ORIGINAL AND 3 COPIES.
+CERTFICATE OF ORIGIN. ISSUED BY THE
ENTER-EXIT INSPETION ANDQUARANTINE
OF THE PEOPLE’ SREPUBUC OF CHJNA.
+CERTIFYINC GOODS ARE IN STRICT AC-
CORDANCE WITH THE SAMPLES.
+FULL SET OF B/L (3 ORICINALS AND 3
COPIES) CLEAN ON BOARD ISSUED TOTHE
ORDER OF THE ARRLICANT. MARKED
"FREIGHT PREPAID" .
+OUALITY CERTIFICATE ISSUED BYTHE
BENEFICIARY OF THE L/C
CHARGES 71B: ALL BANKING CHARGES OUT SIDE SRILAN-
KA AREFOR ACCOUNT OF BENEFICIARY.
PERIOD FOR PRESENTATION 48: DOCUMENTS MUST BE PRESENTED WITHIN 14
DAYS AFTER THE DATE OF SHIPMENT BUT
WITHIN THE VAUDITY OF THE CREDIT.
4.补充资料:
(1)INVOICE NO. : PE109070826
f21PACKING G. W. N. W. MEAS.
LADIES SKIRTS, STYLE NO. A101 (kgs) (kgs) (m3)
Packed in 1 carton of 1 DOZ each 3.5/CTN 3.0/CTN 0.04/CTN
LADIES SKIRTS. STYLE NO. A102
Packed in 1 canon of 1 DOZ each 3.5/CTN 3.0/CTN 0.04/CTN
Packed in ONE 20’ FCL
(3)H. S. CODE: 8109.2900
(4)注册号:QD8965461
(5)CERTIFICATE NO. : 5928271032
(6)FREIGHT FEE: USD 1750.00
(7)REFERENCE NO. : 9302847290
(8)B/L NO. : TMC09071621
(9)B/L DATE: JULY 16, 2009
(10)VESSEL: TMCSSEL V. 890
(11)集装箱号:TMCU982171
(12)报检单位登记号:3876746295
(13)报检单编号:QD3436323456346
(14)生产单位注册号:8792393789
(15)青岛服装进出口公司海关注册号:2938488220
(16)货运公司编号:ZWY0607091
(17)人民币账号:RMB09112988
(18)外币账号:WB299910012
(19)海关编号:2819388211
(20)境内货源地:青岛
(21)生产厂家:青岛服装进出口公司
二、根据上述资料缮制下列单据
1.商业发票
QINGDAO CLOTING IMPORT & EXPORT CORPORATION

29, PINGAN ROAD QINGDAO, CHINA

TEL: 0086-532-84273456 INV. NO. :
FAX: 0086-532-84273457 DATE:
E-Mail: JSC@163.com S/C NO. :
COMMERCIAL INVOICE

TO:
FROM ______ TO ______
IMC NO: ______ ISSUED BY: ______
MARKS & NO.DESCRIPTIONS OF GOODS QUANTITYUNIT PRICE AMOUNT

TOTAL

TOTAL AMOUNT:
WE HEREBY CERTIFY THAT THE ABOVE MENTIONED GOODS ARE OF CHINESE ORIGIN.
____________
× × ×
2.装箱单
QINGDAO CLOTHING IMPORT & EXPORT CORPORATION

29, PINGAN ROAD QINGDAO, CHINA

TEL: 0086-532-84273456 INV. NO. : ______
FAX: 0086-532-84273457 DATE: ______
E-Mail: JSC@163.com S/C NO. : ______
PACKING LIST

TO: MARKS & NOS.
CASE NO. GOODS DESCRIPTION & PACKING QTY()G.W.()N.W.()MEAS.(M3)

TOTAL


SAY TOTAL PACKED IN *******************************************ONLY.

________________________

× × ×

3.质量证明

QINGDAO CLOTHING IMPORT & EXPORT CORPORATION


29, PINGAN ROAD QINGDAO CHINA


TEL: 0086-532-84273456 INV. NO. : ______

FAX: 0086-532-84273457 DATE: ______

E-Mail: JSC@163.com S/C NO. : ______

QUALITY CERTIFICATE


MARKS & NOS.

_______________________________________

_______________________________________

_______________________________________

_______________________________________

___________

× × ×

4.汇票



5.普惠制产地证明书申请书和普惠制产地证书

(1)普惠制产地汪明书申请书

普惠制产地证明书申请书


申请单位(加盖公章): 证书号:______

申请人郑重申明: 注册号:______

本人被正式授权代表本企业办理和签署本申请书。

本申请书及普惠制产地证明书格式A所列内容正确无误,如发现弄虚作假,冒充格式A所列货物,擅改证书,自愿接受签发机构的处罚并承担法律责任。现将有关情况申报如下:



(2)普惠制产地证书



6.出境货物报检单

中华人民共和国出入境检验检疫


出境货物报检单


报检单位(加盖公章): *编号: ______

报检单位登记号: 联系人: 电话: 报检日期: 年 月 日



注:有“*”号栏由出入境检验检疫机关填写 ◆国家出入境检验检疫局制

7.海运货物委托书和海运提单

(1)海运货物委托书



(2)海运提单



8.出口货物报关单

中华人民共和国海关出口货物报关单


预录入编号: 海关编号:



9.装运通知

QINGDAO CLOTHING IMPORT & EXPORT CORPORATION


29, PINGAN ROAD QINGDAO, CHINA


TEXl: 0086-532-87243456 INV. NO. : ______

FAX: 0086-532-87243457 DATE: ______

E-mail: JSC@163.com S/C NO. : ______

SHIPPING ADVICE


TO:

DEAR SIRS,

WE HEREBY INFORM YOU THAT THE GOODS UNDER THE ABOVE MENTIONED CREDIT HAVE BEEN SHIPPED. THE DETAILS OF THE SHIPMENT ARE STAED BELOW.

COMMODITY: ______

NUMBER OF CTNS: ______

TOTAL G. T: ______

OCEAN VESSEL: ______

DATE OF DEPARTURE: ______

B/L NO. : ______

PORT OF LOADING: ______

DESTINATION: ______

SHIPPING MARKS:

__________________

× × ×