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Chemistry
Page 5
Questions (98,013)
Calculate the standard enthalpy change and the standard entropy change for the combustion of 1 mole of acetylene (C2H2) at 25oC
5 answers
asked by
Ash
1,417 views
Salts that are insoluble in water are made by precipitation.
● Lead(II) iodide, PbI2, is insoluble in water. ● All nitrates
4 answers
asked by
PP
1,147 views
How many grams equal 6.3 mol of N2?
4 answers
asked by
pinky
1,204 views
For the formation of ammonia, the equilibrium constant is known to be 5.2 × 10^−5 at 25◦C. After analysis, it is determined
5 answers
asked by
Sara
1,864 views
Calculate the Gibbs free energy change for the reaction below when initial concentrations of CR3+ and Cu2+ are 1 M (F= 96500 J/V
4 answers
asked by
audrey
1,919 views
does anyone have the answers for Calculating mass quick check?
1. Which option correctly describes the reactants and products of
10 answers
asked by
Anonymous
6,419 views
consider the equation for the following reaction at equilibrium. X+Y<-->2Z+heat the concentration of the product could be
5 answers
asked by
Jazmin F.
3,309 views
Just wanted to make sure I did this right.
Use the equation to answer the question. FeCl3 +3NH4OH—-> Fe(OH) 3 +3NH4Cl Which
4 answers
asked by
:)
458 views
Use the following table of volumes and concentrations of strong acids and bases to determine the final pH for each solution (a -
4 answers
asked by
husoy
902 views
How many of the following changes would alter the numerical value of the equilibrium constant Kp for the reaction 2OF2(g) ⇀
4 answers
asked by
Sara
856 views
how much copper sulphate will require saturating 80 grams of water at 20 degree celcious .if solubility of copper sulphate at
4 answers
asked by
diwas pathak
1,231 views
Which element has the same number of valence electrons as bromine (Br)?
1.krypton 2.potassium 3.selenium** 4.chlorine i think the
30 answers
asked by
Caca Fleischmann
10,496 views
Calculate the lattice energy of potassium oxide from the following data:
Enthalpy of sublimation of potassium: +89.24 kJ/mol Bond
5 answers
asked by
Joanie
13,505 views
Calculate the enthalpy of combustion of C3H6:
C3H6 (g) + 9/2 O2 (g) yield 3CO2 + 3H2O using the following data: 3C (s) + 3H2 (g)
4 answers
asked by
Mandy
9,387 views
1. The atomic mass is equivalent to 1/12 of the mass of a neutral atom of which element?
a. gold b. hydrogen c. carbon d. oxygen
10 answers
asked by
frank ocean
7,312 views
An atom of potassium (K) has 19 protons: 18 electrons in its inner electron energy levels and 1 electron in its outer energy
4 answers
asked by
Josh
4,147 views
A solid acid is dissolved in enough water to make 200 ml of a solution. 40.0ml of the solution is titrated to a phenolphthalein
5 answers
asked by
Aria
1,466 views
How many grams of sucrose are dissolved in 400 grams of a 12% ogueaus solution of sucrose?
5 answers
asked by
Araceli
4,169 views
To what volume should 1.19 ml of an 8.00 m acetic acid solution be diluted in order to obtain a final solution that is 1.50 M?
sh
6 answers
asked by
liz
1,805 views
Vinegar contains ethanoic acid (CH3OOH).titration of 3.00g of vinegar with 0.12M NAOH Solution requires 23.0cm3 to reach the
5 answers
asked by
Ekekhide
1,207 views
What would be the effect on the percent acetic acid if 30 mL of vinegar had been used in place of 50 mL? Explain?
4 answers
asked by
Gwyneth
1,376 views
The Ksp of PbBr2 is 6.60× 10^–6.
What is the molar solubility of PbBr2 in pure water? What is the molar solubility of PbBr2 in
6 answers
asked by
Anon
37,248 views
The oxidation number of sulphur in CuSO4.5H2O is ......
12 answers
asked by
Anonymous
8,688 views
Which equation shows conservation of mass and charge?
A.NH4Br → NH3 + Br2 B. 2Mg + Fe3+ → Mg2+ + 3Fe C. H2SO4 + LiOH →
6 answers
asked by
Angie
7,211 views
A current of 45A is passed through a solution of gold salt for 1 hour 45 minutes calculate (a) the mass of gold deposited (b)
7 answers
asked by
Joy
2,681 views
A direct-current power supply of low voltage (less than 10 volts) has lost the markings that indicate which
output terminal is
5 answers
asked by
Confused
3,844 views
Plastic articles can be chromium-plated by coating them with thin layer of graphite paste,placing them in a bath of aqueous
5 answers
asked by
harish
3,942 views
BrO3- + 5Br- + 6H+ <--> 3Br2 + 3H2O
If 25.0 ml of 0.200-molar BrO3- is mixed with 30.0 ml of 0.45-molar Br- solution that
5 answers
asked by
Andrew
4,880 views
How many molecules of lithium carbonate are there in 8.62 g of the compound?
a) 74 molecules b) 647 molecules c) 0.12 molecules
4 answers
asked by
lil
1,363 views
copper compounds such as copper (II) sulfate are toxic. before disposal, these compounds must be treated to reduce their
6 answers
asked by
Josh
6,905 views
How much heat would be released by burning one gallon of octane? The density of octane is 0.703g/mL. 1 gallon= 3.79 liters.
4 answers
asked by
Amber
4,488 views
the question reads:
a) balance the equation: H3PO4 + Ca(OH)2 --> Ca3(PO4)2 + H2O b)what mass of each product results if 750 mL of
5 answers
asked by
Anonymous
4,445 views
The graph shows the titration curve for 25.0mL of an aqueous solution of B titrated with 0.100MHCl. Which of the following best
5 answers
asked by
qwerty
3,688 views
A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight
6 answers
asked by
Peter
2,294 views
What is the total iconic equation and net ionic equation of the reaction between barium nitrate and ammonium oxalate Ba(NO3)2 +
4 answers
asked by
Anonymous
7,507 views
Nitric acid is produced commercially by the Ostwald
process, represented by the following equations: 4NH3(g) + 5O2(g) > 4NO(g) +
4 answers
asked by
Shawn
4,588 views
The pH of a .200M HBrO solution is 4.67. What is the acids Ka?
4 answers
asked by
Shayla
1,669 views
10.0 g of NH4NO3 is dissolved in enough water to make 450.0 mL of solution. What is the molarity of the solution?
4 answers
asked by
Adrian Perez
750 views
Two moles of a nonelectrolyte solute are dissolved in 1 kg of an unknown solvent. The solution freezes at 7.8 degrees Celsius
5 answers
asked by
Alyssa
3,419 views
The equilibrium constant, Keq, for the reaction:
SO3(g) + NO (g) ⇋ NO2 (g) + SO2 (g) was found to be 0.500 at a certain
4 answers
asked by
arshly
1,461 views
A 30.75 mL sample of 0.450 MKOH was titration with an unknown concentration of HCl. The endpoint was reached when 29.35 mL of
9 answers
asked by
Rebecca
1,629 views
How many grams of NH3 is there in 800 cm^3 at STP of NH3 gas?
3 answers
asked by
Shipra
1,218 views
This questions has 5 parts but I already have the answers for a and b. I need help on the last three parts.
In an electrolytic
3 answers
asked by
anonymous
1,903 views
4. Calculate the mass of zinc carbonate that would remain if 17.0g of zinc carbonate was
reacted with 50cm3 of 4M nitric acid.
3 answers
asked by
Freddy
670 views
From the following:
pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2
5 answers
asked by
Sal
5,432 views
Find the percentage composition of calcium in the following compound, round to the nearest hundredth of a percent.
calcium
1 answer
asked by
murder
37 views
When an element is burnt in excess oxygen, is the oxide formed always:
1. a crystalline solid 2. greater in mass than the element
5 answers
asked by
Monica
2,810 views
What is the approximate pH of a solution labeled 6 x 10^-5 M HBr?
7 answers
asked by
jahil
6,505 views
Which is reduced in the following reaction:
Cr2O72-+6S2O32-+14H+>2Cr3+ + 3S4O62- + 7H20 A. H+ B. Cr6+ C. S4O62- D. S2+ E. O2- I
4 answers
asked by
Debbie
6,476 views
We did not use the volume of the water added initially to the Erlenmeyer in our calculations. Why?
5 answers
asked by
Kim
1,965 views
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