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Chemistry
Page 43
Questions (96,980)
Given that R= 0.0821(L⋅atm) / (mol⋅K) how many moles must be in a 2L container at
1.8 atmospheres with a temperature of 270K?
4 answers
asked by
snowey
440 views
The Ksp for silver chromate (Ag2CrO4) is 1.1x10-12. Using the same initial set up of 10mL of 1M silver nitrate is combined with
4 answers
asked by
Anonymous
1,351 views
In a reaction Mg(s) + 2HCl(aq) → H2(g) + MgCl2(aq), 6.00 g of Mg was present at 0.00 min. After 3.00 min, 4.50 g of Mg
4 answers
asked by
Mohamed El amine
1,085 views
Calculate the pH of the solution resulting from the addition of 75.0 mL of 0.15 M KOH to 35.0 mL of 0.20 M HCN (Ka (HCN) = 4.9
4 answers
asked by
The anonymous
2,206 views
Calcium carbonate of mass 10g was heated until there was no further change
A. Write an equation for the reaction B. Calculate the
4 answers
asked by
Stephen
1,279 views
In a gaseous mixture of CH4 and C2H6, there are twice as many molecules of CH4 as C2H6. The partial pressure of CH4 is 40 mmHg.
5 answers
asked by
Jack
847 views
A 0.879 g sample of a CaCl2 ∙ 2 H2O / K2C2O4 ∙ H2O solid salt mixture is dissolved in 150 mL of
deionized water. A
5 answers
asked by
Destiny
7,305 views
If a gas effuses 1.618 times faster than Kr (molar mass = 83.8 g/mol) what is the molar
mass of the gas?
4 answers
asked by
Scott
3,625 views
10.5g of potassium trioxonitrate(v) salt saturated 5g of solvent at 15°c. Calculate the solubility of potassium
5 answers
asked by
Isaac
3,958 views
give the name of the process when anhydrous copper sulphate becomes wet
10 answers
asked by
augustine
1,580 views
How many atoms of oxygen are there in 5.00g of copper(II) sulfate pentahydrate?
4 answers
asked by
Bob
2,155 views
The pK3 of formic acid is 3.75
A)what is the pH of a buffer in which formic acid and sodium formate have equimolar concentration?
6 answers
asked by
Liz
2,226 views
How many grams of NH4Cl must be added to 0.560 L of 1.90 M NH3 solution to yield a buffer solution with a pH of 8.50? Assume no
5 answers
asked by
hannah
3,383 views
Calculate the molality of of a sol'n whose density is 1.15 g/ml
4 answers
asked by
Matt
2,822 views
At 60 celsius the value of Kw is 9.5x10^-14. considering this waht is the calculated value for the pOH of a 2.00x10^-3 M HCL
5 answers
asked by
HELPP
1,594 views
) Which of the following should dissolve the smallest amount of silver sulfide per liter, assuming no complex formation? A) 0.1
4 answers
asked by
sana
2,258 views
Given the reaction: C3H8(g) + 5O2(g) �¨ 3CO2(g) + 4H2O(g)
What is the total volume of H2O(g) formed when 8.00 liters of C3H8(g)
4 answers
asked by
Dillon
3,346 views
Calculate the molality of methanol in a solution prepared by dissolving 75.0 mL of methanol, CH3OH (d = 0.791 g/mL), in 150 g of
5 answers
asked by
CC
2,358 views
What is an experimental technique that could be used to determine the enthalpy of combustion of magnesium directly? Not using
5 answers
asked by
z.
1,687 views
Write out the net ionic equation for:
Cd(NO3)2 + Na2S -----> 2NaNO3 + CdS ----- thanks!! Write out the net ionic equation for:
4 answers
asked by
Tessa
7,383 views
Calcalate the mass of silver deposited when a current of 2.6A is passed through a solution silver salt for 70mins?
4 answers
asked by
Rimamtang Josiah
367 views
The amount of energy released by the combustiom of 100 g of C2H2 (g) is ______ MJ.
2CH2 + 5O2 ----> 4CO2(g) + 2H2O(g) ΔH=
5 answers
asked by
Anonymous
1,449 views
41. Ethyne, C2H2, used in welding react with oxygen as shown below.
4 answers
asked by
mark
2,512 views
Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 × 10-59, and dissociates according to
Ca10(PO4)6(OH)2(
4 answers
asked by
Angelyka
3,171 views
Consider the following cell:
Pt|H2(g, 0.460 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 1.00 V at
5 answers
asked by
Daisy
8,885 views
A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250. g of water freezes at −2.34°C. Calculate the molar mass
4 answers
asked by
Diana
3,713 views
Calculate the expansion work done when 50 g of water is electrolysed under constant pressure at 25C
10 answers
asked by
Dana
7,908 views
a 1.00 L aqueous solution contained 5.80 g of NaOH. what is the pH of the solution?
Can someone help me out with the setup of
6 answers
asked by
Anna
2,991 views
The Ka values of H3PO4 are shown below.
Ka1 7.5 10-3 Ka2 6.2 10-8 Ka3 4.8 10-13 What is the pH of a 0.19 M solution of NaH2PO4?
5 answers
asked by
Chem Confused
1,829 views
Write out all the mole ratios of Al + H2SO4 —> Al2(So4)3 + H2 there are 5 in total
6 answers
asked by
gabe
880 views
How would 250 ml of o.15 M KNO3 solution be prepared?(in form of equation)
4 answers
asked by
Kawnullah
633 views
What is the pH of the buffer system after the addition of 0.10 mole of gaseous HCl to 1 L of the solution. With a buffer system
4 answers
asked by
Dr xD
1,786 views
Which solution will contain the higher concentration of chloride ions? 0.31mol/l sodium chloride or 0.16mol/l magnesium chloride
4 answers
asked by
Debby
516 views
When lead (IV) oxide is heated with hydrogen, the following reaction occurs:
PbO2(s) + 2H2(g) → Pb(s) 2H2O(g) This reaction
4 answers
asked by
Ibraheem
1,287 views
An impure sample of barium hydroxide of mass 1.6524 g was allowed to react with 100 cm3 of 0.200 mol dm-3hydrochloric acid. When
4 answers
asked by
Anonymous
3,960 views
39.8g of a mixture of potassium chloride, KCl, and potassium trioxochlorate(V), KClO3, were heated to a constant mass. If the
4 answers
asked by
Oyinade
1,641 views
An electrochemical cell of notation Pd | Pd²⁺ || Cu²⁺ | Cu has E° = -0.65 V. If we know that the standard reduction
4 answers
asked by
stefani
1,084 views
For the decomposition of ammonium chloride NH4cl(s) =>NH3(g)+Hcl (g) at 427degree centigrade , kp=4.8 calculate kc for this.
4 answers
asked by
Feruza
1,351 views
how many grams of NaCl required to prepare in 2500 ppm(w/v) NaCl 250 mL solution
4 answers
asked by
lynda
2,664 views
Vinegar is a solution of acetic acid, a weak acid. How can you produce more acetate ions in the solution?
CH 'subtext' 3 COOH(aq)
4 answers
asked by
emma
1,710 views
Calculate the amount of hydrochloric acid in 25cm3 of 0.100M HCl
4 answers
asked by
Jess
1,076 views
Not sure if i posted this but
Need help with my pH calculations? 0.10 mol of solid sodium hydrogen carbonate and 0.20 mol of
3 answers
asked by
dan
762 views
"Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of the following aqueous
4 answers
asked by
Kate
4,924 views
So I have the balanced equation:
c3H8 +502 = 3C02 +4H20 Question: At STP propane (C3H8) burns in oxygen to form 2.15L of carbon
4 answers
asked by
Stefan
1,223 views
50.0 mL of 0.116 M NaOH is titrated with 0.0750 M HCl. Calculate the pH after the addition of 5.0 mL volume of acid.
4 answers
asked by
Nathan
1,338 views
At 25 degrees Celsius all of these are true for a neutral solution : pH = 7.00, pOH = 7.00, and [H+] = [OH-] is that correct?
For
6 answers
asked by
Katherine
5,095 views
What is the Ph for the solution made from 11.10mL of 0.278M HCL solution mixed with 70.90mL of 0.1300M ammonia solution? The pKa
4 answers
asked by
Lucy
1,090 views
Please help
the question that I got is: Calculate how much 95% ethyl alcohol will be required to dissolve 075g sulfanilamide at
5 answers
asked by
Andy
3,402 views
hi! this question confuses me.
"Pennies have mass of approximately 2.5 g. How many pennies are needed to make a mole of copper?"
5 answers
asked by
Carly
1,479 views
Write formula equations and net ionic equations for the hydrolysis of the following salts in water.
a. sodium carbonate b.
10 answers
asked by
anonymous
5,425 views
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