25,963 Answered Questions for the topic chemistry

Chemistry

05/30/23

Hess' Law Chemistry
When using Hess’s Law to calculate rnthalpy of a rxn, what does a negative or positive (delta)H mean? When do you add or subtract and why?
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Chemistry

05/29/23

Chemistry question

A solution is made by combining 75.0 mL of 0.0040 M Na2SO4 and 25.0 mL of 0.080 M AgNO3. Calculate the final concentrations of all four ions in solution. The Ksp of Ag2SO4 is 1.5 x 10^-5.
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Chemistry

05/29/23

Chemistry question

Determine the equilibrium concentrations of both Cu(NH3)4 2+ and Cu2+ in a solution made initially to be 0.010 M Cu(NO3)2 and 0.100 M NH3. The Kf for Cu(NH3)4 2+ is 1.0 x 10^-12
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Chemistry

05/29/23

Is work function of a metal the same as ionisation energy?
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Chemistry

05/29/23

Chemistry question

Which ion has the largest radius? (A) CI- (B) F- (C) K+ (D) Ca2+ could you explain which option is the correct answer?
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Chemistry

05/29/23

Chemistry question

In which pair of particles is the first member larger than the second member?(A) Li + ; Be2+(B) Li + ; Li(C) Li + ; Na +(D) Be; MgCould you explain which option is the correct answer
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Chemistry

05/29/23

Calculate the heat involve 2.0g of (NaOH) undergoes a temperature change of 20°c
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Chemistry

05/27/23

The combustion of propane may be described by the chemical equation C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(g) How many grams of O2(g) are needed to completely burn 80.5 g C3H8(g)?

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Chemistry

05/26/23

There are 2.45 moles of gas at a pressure of 38.4 atm and a temperature of 401 K. What id the volume

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Chemistry

05/26/23

Determine the empirical formula and the molecular formula for Ibuprofen.

buprofen, the pain reliever in Advil and Motrin contains 75.69% C, 8.80% H, and 15.51% O by mass. The molecular mass is 206.3 g/mol. Determine the empirical formula and the molecular formula for... more
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Chemistry

05/26/23

The total mass of aluminum hydroxide at the end of the reaction was 0.94g. What was the percent yield of this experiment?
A student in a chemistry lab mixes 13.8g of aluminum sulfate with 2.04g calcium hydroxide to produce aluminum hydroxide and calcium sulfate.The unbalanced reaction is: Al2(SO4)3 + Ca(OH)2  Al(OH)3+... more
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Chemistry

05/26/23

What mass of aluminum hydroxide is produced?
A student in a chemistry lab mixes 13.8g of aluminum sulfate with 2.04g calcium hydroxide to produce aluminum hydroxide and calcium sulfate.The unbalanced reaction is: Al2(SO4)3 + Ca(OH)2  Al(OH)3+... more
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Chemistry

05/26/23

limiting reactant

A student in a chemistry lab mixes 13.8g of aluminum sulfate with 2.04g calcium hydroxide to produce aluminum hydroxide and calcium sulfate.The unbalanced reaction is: Al2(SO4)3 + Ca(OH)2  Al(OH)3+... more
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Chemistry

05/25/23

what is the expression for keq for: 3a(g)+1b(g)<->2c(g)+2d(g)
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Chemistry

05/24/23

How many grams of \textrm{Ag}_2 \textrm{O} are required to produce [var:O2] L oxygen gas via decomposition at 102.3 kPa and 175°C? 2

2Ag2O=4Ag+O2
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Chemistry

05/24/23

what is the total concentration of all ions in a solution formed by dissolving 1.50 g Al2(SO4)3 in 100.0 ml of solution?
what is the total concentration of all ions in a solution formed by dissolving 1.50 g Al2(SO4)3 in 100.0 ml of solution?
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Chemistry

05/24/23

Are claw machines an example of high entropy? explain
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Chemistry

05/24/23

At 25 C, Keq = 0.90 for the reaction: H2O + Cl2O = 2HOCl (all gases)
Calculate the concentrations of all species at equilibrium a) if 1.0g of H2O and 4.83 g of Cl2O are mixed in a 1-L flask. b) 1.0 mol of pure HOCl is placed in a 2.0-L flask
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Chemistry

05/23/23

Requesting a tutoring session
I thought I messaged and requested a tutoring session for my son last night for a session today, but didn’t receive any email notifications.I also can’t seem to send a message to the previous tutor... more
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Chemistry

05/23/23

How many grams of sodium sulfate will be formed if you start with 5 moles of sodium hydroxide?
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Chemistry

05/23/23

How many moles of sodium react with 25g of chlorine to produce sodium cholorine?
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Chemistry

05/23/23

Pb(SO4)2 + 4 LiNO3 -> Pb(NO3)4 + 2 LiSO4. How many moles of Lithuim nitrate will be needed to make 250g of Lithuim sulfate?
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Chemistry

05/23/23

Use the following equations: Fe2O3 + 3 H2 -> 2 Fe + 3 H20 How many grams of iron can be made from 0.103 moles of Fe2O3
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Chemistry

05/23/23

How many moles of rust iron (lll) oxide are produced when 15g of iron reacts with enough oxgen?
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Chemistry

05/23/23

Ammonia (NH3) clouds are present around some planets. Calculate the number of moles of ammonia produced by the reaction of 5.4 g of hydrogen with an excess of nitrogen. N2 + 3 H2 ->2 NH3
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