Homework Answers
1. Mass of the ring = 9.08 g
Mass of gold in the ring = 75 / 100 * 9.08 = 6.81 g
Moles of Gold = mass of gold / molar mass of Gold = 6.81 / 197 = 0.0345 moles
Atoms of Gold = moles of gold * Avogadro number = 0.0345 * 6.022 * 1023 = 2.08 * 1022 atoms
Add Answer to:
Complete each question with the best for math questions, the proper number of dicanture 1. You've...
3. A1.22 g solid sample of impure lead (11) nitrate was dissolved in 40.0 mL of...
3. A1.22 g solid sample of impure lead (11) nitrate was dissolved in 40.0 mL of distilled water and analyzed by gravimetric analysis. Sodium sulfate was delivered from a burette to precipitate the lead ions as lead sulfate. Sodium sulfate was added until no more precipitate was seen to form. The precipitate was filtered, washed an dried before been weighed. When weighed, the precipitate had a mass of 1.44 g. What is the mass percent of lead in the original...
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many...
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 11.874 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.300 M sodium sulfate is added, a white precipitate forms. The sodium sulfate solution is added until no more precipitate forms, then a few excess milliliters are added. The precipitate is filtered, washed, and dried. It has a...
EXPERIMENT 9 CHEMICAL REACTIONS: STOICHIOMETRY LABORATORY REPORT Your Name TA's Name You must rea...
EXPERIMENT 9 CHEMICAL REACTIONS: STOICHIOMETRY LABORATORY REPORT Your Name TA's Name You must read pages 69 and 70 to complete the following calculations. Lab Section 1411. Date Trial #1 Trial #2 Trial #3 vol . 0.100 M K2CO, solution -1200 mL 12.00 mL mmole K2CrO vol. 0.100 M Pb(NO,), solution 10.00ml mmole Pb(NO) 12.00m 14.00 mL 20 g mass product+paper 0.579 g0.654 g mass dry filter paper 0266 mass PbCrO, collected precip. 9 mmole Pbcro, CALCULATIONS AND QUESTIONS (USE THE...
I need helppp with my AP chem lab
Purpose: To calculate the amount of AgNO3 present in an unknown solution of water through the process of gravimetric analysis with NaCl. Background: Have you ever had difficulty lathering soap or find that the scum in your shower constantly needs to be removed? These are signs of “hard water.” Soap does not lather well in hard water because metal ions, such as Ca2+, form precipitates, creating “soap scum.” A precipitate is an insoluble compound that forms when soluble ions in...
please solve what you can and show your work. I'm not really good in chemistry??♀️ Home...
please solve what you can and show your work. I'm not really
good in chemistry??♀️
Home assignment: Chapter 4: Aqueous Reactions and Solution Stoichiometry 1) Of the species below, only is not an electrolyte. A) HCI B) Rb2804 C) Ar D) KOH E) NaCI 2) Aqueous potassium chloride will react with which one of the following in an exchange (metathesis) reaction? A) calcium nitrate B) sodium bromide C) lead nitrate D) barium nitrate E) sodium chloride 3) When aqueous solutions...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent for the reduction of dehydes and ketones to 1" and 2 alcohols, respectively. The mechanism of the reaction - (below) is straightforward and is driven by boron's affinity for oxygen. In addition, given borohydride's remarkably low reactivity with OH groups under neutral and especially basic conditions, this reaction can be done in alcohol solvents. This means that (unlike LAH or Grignard reactions) no separate...
titration lab report additional images of lab report QUESTIONS 1. A student masse 0878 of an...
titration lab report
additional images of lab report
QUESTIONS 1. A student masse 0878 of an unknown acid follows the titration procedure required to reach the endpoint on a 10.0 ml Calculate the molar mass of the acid. masses out 0.878 of die in 100 ml volume and titration procedure of Partsherds th the average volume of Non to reach the endpoint on 100 ml aliquot of the acid solution is 18.3 m . 2. In the vinegar titrations (Part...
can someone please answer number one? im so lost DYES AND DYEING CHAPTER 1. Calculate the...
can someone please answer number one? im so lost
DYES AND DYEING CHAPTER 1. Calculate the amounts of salicylic acid, 1-naphthol, 2-naphthol, 8-anilino-1-naph- thalenesulfonic acid ammonium salt, or N,N-dimethylaniline needed for Part 1B of this experiment (use molecules as assigned by your TA). 190mg 3-aminobenzene 2.5mL Sulfonic acid 2.5% sodium carbonate solution 81mg Sodium nitrate 2. What is the purpose of the sodium carbonate in Part 1A? Why do we add glacial acetic acid in Part 13 when we react...
d. Suppose you mistakenly acidify the filtrate with HCl instead of with HNO3. What would you...
d. Suppose you mistakenly acidify the filtrate with HCl instead of with HNO3. What would you obser after completing the halide test, and what would that observation lead you to conclude? Organic Laboratory Technique Primer Sodium Fusions and lon Testing Background: The elements that commonly occur in organic compounds along with carbon, hydrogen, and oxygen, are: nitrogen sulfur, and the halogens. The detection of these latter three elements depends on converting them into water soluble lons (CNS , and X...
The following primary standards can be used for the standardization of bases except. a. Benzoic acid...
The following primary standards can be used for the standardization of bases except. a. Benzoic acid b. Oxalic acid c. CaCO3 d. KHP A solution that may contain NaOH, Na 2CO3, and NaHCO3, alone or in compatible combination was titrated with 0.1200 M HCl. The volume of the acid required to reach the phenolphthalein endpoint was 25.67 mL while 38.13 mL to reach the methyl red endpoint. What are the components of the mixture? a. Na2CO3 only b. NaOH only...
3. A1.22 g solid sample of impure lead (11) nitrate was dissolved in 40.0 mL of distilled water and analyzed by gravimetric analysis. Sodium sulfate was delivered from a burette to precipitate the lead ions as lead sulfate. Sodium sulfate was added until no more precipitate was seen to form. The precipitate was filtered, washed an dried before been weighed. When weighed, the precipitate had a mass of 1.44 g. What is the mass percent of lead in the original...
EXPERIMENT 9 CHEMICAL REACTIONS: STOICHIOMETRY LABORATORY REPORT Your Name TA's Name You must read pages 69 and 70 to complete the following calculations. Lab Section 1411. Date Trial #1 Trial #2 Trial #3 vol . 0.100 M K2CO, solution -1200 mL 12.00 mL mmole K2CrO vol. 0.100 M Pb(NO,), solution 10.00ml mmole Pb(NO) 12.00m 14.00 mL 20 g mass product+paper 0.579 g0.654 g mass dry filter paper 0266 mass PbCrO, collected precip. 9 mmole Pbcro, CALCULATIONS AND QUESTIONS (USE THE...
please solve what you can and show your work. I'm not really
good in chemistry??♀️
Home assignment: Chapter 4: Aqueous Reactions and Solution Stoichiometry 1) Of the species below, only is not an electrolyte. A) HCI B) Rb2804 C) Ar D) KOH E) NaCI 2) Aqueous potassium chloride will react with which one of the following in an exchange (metathesis) reaction? A) calcium nitrate B) sodium bromide C) lead nitrate D) barium nitrate E) sodium chloride 3) When aqueous solutions...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent for the reduction of dehydes and ketones to 1" and 2 alcohols, respectively. The mechanism of the reaction - (below) is straightforward and is driven by boron's affinity for oxygen. In addition, given borohydride's remarkably low reactivity with OH groups under neutral and especially basic conditions, this reaction can be done in alcohol solvents. This means that (unlike LAH or Grignard reactions) no separate...
titration lab report
additional images of lab report
QUESTIONS 1. A student masse 0878 of an unknown acid follows the titration procedure required to reach the endpoint on a 10.0 ml Calculate the molar mass of the acid. masses out 0.878 of die in 100 ml volume and titration procedure of Partsherds th the average volume of Non to reach the endpoint on 100 ml aliquot of the acid solution is 18.3 m . 2. In the vinegar titrations (Part...
can someone please answer number one? im so lost
DYES AND DYEING CHAPTER 1. Calculate the amounts of salicylic acid, 1-naphthol, 2-naphthol, 8-anilino-1-naph- thalenesulfonic acid ammonium salt, or N,N-dimethylaniline needed for Part 1B of this experiment (use molecules as assigned by your TA). 190mg 3-aminobenzene 2.5mL Sulfonic acid 2.5% sodium carbonate solution 81mg Sodium nitrate 2. What is the purpose of the sodium carbonate in Part 1A? Why do we add glacial acetic acid in Part 13 when we react...
d. Suppose you mistakenly acidify the filtrate with HCl instead of with HNO3. What would you obser after completing the halide test, and what would that observation lead you to conclude? Organic Laboratory Technique Primer Sodium Fusions and lon Testing Background: The elements that commonly occur in organic compounds along with carbon, hydrogen, and oxygen, are: nitrogen sulfur, and the halogens. The detection of these latter three elements depends on converting them into water soluble lons (CNS , and X...
Most questions answered within 3 hours.
-
A 0.035 mol sample of a weak acid, HA, is dissolved in 437 mL of
water...
asked 4 minutes ago -
a sample of Ar gas has a volume of 6.30 L with an unknown
pressure. the...
asked 5 minutes ago -
The
serum cholesterol levels of a population of kids follow a normal
distribution with mean 155...
asked 25 minutes ago -
han discusses the racist practice of badlands, a bar
in the Castro
district of San Francisco,...
asked 37 minutes ago -
A sample of final exam scores is normally distributed with a
mean equal to 25 and...
asked 40 minutes ago -
An investor shorts 100 shares of a stock when the share price is
$50 and closes...
asked 44 minutes ago -
LLOP corporation just paid 4$ dividend per share, you expect the
dividend to grow 8% for...
asked 53 minutes ago -
if we subtract 1000 from 0001 is there overflow? (binary)
asked 1 hour ago -
Hello, I need help with the function below, The language I am
using is Ocaml
open...
asked 1 hour ago -
Explain how the presence of glucose represses the gal structural
genes?
asked 1 hour ago -
For the reaction CaI2+2AgNO3⟶2AgI+Ca(NO3)2 how many grams of
silver iodide, AgI, are produced from 56.5 g...
asked 1 hour ago -
Write an equation for hydrolysis via acid catalysis.
Using ethyl acetate, ethyl benzoate, ethyl formate or...
asked 1 hour ago