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how many moles does 1.23x1023 molecules of CaCl2 represent?
how many atoms of copper are found in 1.34 moles of copper?
1. When 9.0 g of hydrogen gas, H2, reacts with oxygen gas, O2, 73.0 g of water is produced.
2H2 + O2 --> 2H2O
a) What is the theoretical yield of water?
b) What is the percentage yield?
2. Powdered zinc metal reacts with sulphur (S8) when heated to produce zinc sulphide.
8Zn + S8 --> 8ZnS
a) What mass of product can be produced with 25 g of zinc?
b) What is the actual yield if the percentage yield was 80%?
3. The thermite reaction has been used to weld railroad rails, make bombs, and ignite solid rocket fuel. The equation of the reaction is:
Fe2O3 + 2Al --> 2Fe + Al2O3
a) What is the theoretical yield of iron if 100.0 g of Fe2O3 is used?
b) What is the percentage yield if 52.3 g of iron is actually produced?
When 9.0 g of hydrogen gas, H2, reacts with oxygen gas, O2, 73.0 g of water is produced. 2H2 + O2 --> 2H2O a) What is the theoretical yield of water? b) What is the percentage yield?
Show all calculations and correct units
Determine the volume of 0.7M hydrochloric acid needed to fully neutralize 60 mL of 0.5M Ca(OH)2.
If 50 mL of 1.2M H3PO4 is neutralized by 75 mL of NaOH, what is the concentration of the NaOH?
What volume of 0.2M HNO3 acid would be needed to fully neutralize 1L of 0.4M KOH?
200 mL of 2M Sr(OH)2 fully neutralized 60 mL of H2SO4. What is the concentration of the acid?
Compare 1.0 mol/L sodium hydroxide with 1.0 mol/L ammonia (written as ammonium hydroxide) by recreating similar diagrams of dissociation and concentration as those provided to you for the acid comparison. Assume ammonia dissociates only 1%. What would you expect to see if you tested the conductivity and pH of each? Why is there a difference in reactivity if there is 1 mole of acid in a given litre?
value of the mass of synthetic gypsum produced for every kilogram of sulcus dioxide recycled, given that the gypsum can be sold to a gyproc wallboard factory for 75 cents per kilogram
Determine the mass of nitrogen found in 8.85g of Pb(NO3)3
Calamine, which is used for relief of skin irritations, is a mixture of zinc and iron oxides. A 1.056-g sample of dried calamine was dissolved in acid and diluted to 250.0 mL. Potassium fluoride was added to a 10.00-mL aliquot of the diluted solution to mask the iron; after suitable adjustment of the pH, Zn2+ consumed 38.37 mL of 0.01133 M EDTA. A second 50.00-mL aliquot was suitably buffered and titrated with 2.30 mL of 0.002647 M ZnY2– solution:
Fe3+ + ZnY2- FeY- + Zn2+
Calculate the percentage of ZnO and Fe2O3 in the sample.
The electron configuration of Cu
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#339914 on Dec 2023