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Chemistry
Page 7
Questions (98,744)
A current of 45A is pass through a solution of gold salt for 1hours 45minute. Calculate Mass of gold deposited, b) number of
7 answers
asked by
Abimbola
2,673 views
CuCO3=CuO +CO2.
Find the mass of 1mole of each substance taking part in the reaction. (Ar:Cu=64,C=12,O=16). When 31g of CuCO3 is
6 answers
asked by
Busola
5,271 views
Which of the following gases would be most likely to experience ideal behavior at high pressures?
a. F2 b. Ne c. C2H6 I think the
5 answers
asked by
Christine
2,190 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
3,691 views
If 100cm3 of oxygen diffuses through a porous plug at 5cm3/sec how long will it take 200cm3 of methane to diffuse through the
4 answers
asked by
Sulaimon Martins
551 views
If 25cm^3 of NaOH solution containing 4.0g per litre of solution neutralised 50cm^3 of a monobasic acid,HX containing 1.8g of
4 answers
asked by
lucy
937 views
Gas is confined in a tank at a pressure of 10.0 atm and a temperature of 15o
C. If half of the gas is withdrawn and the
5 answers
asked by
Angie
2,049 views
28g of NH3 is dissolved in 500mL of water. What is the concentration of the resulting solution?
(I do not understand how to solve
5 answers
asked by
Amir
896 views
1. You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving
4 answers
asked by
David
3,117 views
A 25.00mL sample of 0.100M HC2H3O2 is titrated with 0.100M NaOH. What is the pH after 25.00mL of NaOH have been added? Ka
5 answers
asked by
Leaf02
894 views
2Cu+O²--->2CuO
Identify the reactans in the equation .write down their names
4 answers
asked by
Neo
1,229 views
calculate the mass, in grams, of NaCl present in each of the following solutions.
6.25 g of 11.5% NaCl solution 452 g of 12.3%
4 answers
asked by
pat
3,476 views
The pH of an NH3 and NH4Cl solution is 9.20. What is the [H3O+]
4 answers
asked by
Leaf02
610 views
The average mass of a solid copper penny is 2.63 g . What is the mass of one mole of pennies?
How would I solve this?
4 answers
asked by
Amy~
1,331 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
1,464 views
A sample of gaseous PCl5 was introduced into an evacuated flask so that the pressure of pure PCl5 would be 0.54 atm at 425 K.
4 answers
asked by
Margaret
4,090 views
laboratoories order hydrochloric acid as a concentrated solution (e.g. 36% W/V). what initial volume of concentrated laboratory
4 answers
asked by
TARA
1,092 views
Which one of the solution have high boiling point 1m H3PO4 or 1m CaCl2 ?
4 answers
asked by
SERHED
802 views
How many liters of gasesous methane (CH4) must be burned in oxygen to produce enough H2O and CO2 to fill a 3.0 L balloon?
Assume
4 answers
asked by
Amy~
1,075 views
What is the most common chemical method for removing H_30^+ ions in aqueous solution? Write a net ionic equation which describes
3 answers
asked by
J.M
2,444 views
How many atoms of Nitrogen are in 4(NH₄)₂CrO₄ ?
A. 1 B. 2 C. 8 D. 4
3 answers
asked anonymously
105 views
is dilution of a solution the answer to acid or base pollution in this world? why?
3 answers
asked by
j
499 views
calculate the percent yield of Cl2 in the electrolytic decomposition of hydrogen chloride if 25 g of HCl produces 13.6 of
5 answers
asked by
Anonymous
5,859 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
5,437 views
Hey this is my question:
At a temperature of 300°C and a pressure of 40.5 MPa, 90.0 mol of H2(g) and 80.0 mol of N2(g) are
3 answers
asked by
yo!
1,439 views
Use the equation to complete the activity.
21986 Rn + Beta→21985 As The nuclear equation shows a form of radon into astatine
3 answers
asked anonymously
78 views
1) How do I prepare 2M nitric acid from 65% concentrated nitric acid?
2) How do I prepare 17% ammonia from 25% concentrated
7 answers
asked by
candy
9,248 views
A 25.0 mL aliquot of vinegar was diluted to 250 mL in a volumetric
flask . Titration of 50 mL aliquot of the diluted solution
4 answers
asked by
reema
2,552 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
2,818 views
At STP, a 5.00L flask filled with air has a mass of 543.251g. The air in the flask is replaced with another gas and the mass of
5 answers
asked by
Kim
4,027 views
"How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2?
N2 + 3H2 ---> 2NH3 ==> 28 g N2 x (1 mol
11 answers
asked by
Emily
27,758 views
2n2o5(g)→4no2(g)+o2(g) when 40g of n2o5 decompose 4.5g of o2 is formed what is the percent yield
7 answers
asked by
Anonymous
2,015 views
What is the purpose for a company to determine percent yield of a product and not just the theoretical yield?
The percent yield
5 answers
asked by
so....help_me
1,225 views
A 1.2M NaOCl solution is prepared by dissolving solid NaOCL in distilled water at 298K. The hydrolysis reaction
OCl-(aq) + H2O(l)
7 answers
asked by
Anonymous
2,180 views
How many atoms of each type are represented in each of the following? f. 5Fe(No3)2 g. 4Mg3(PO4)2 h. 2(NH4)2SO4
4 answers
asked by
victoria
3,394 views
Some reactions that are predicted by their sign deltaG to be spontaneous at room temperature do not proceed at a measurable rate
6 answers
asked by
kali
3,424 views
Which of the following statements best defines chemical equilibrium?
a state in which the concentration of the reactants equals
10 answers
asked by
cheeze
3,736 views
Please! This is urgent!
I don't know how to do this. Determine the solubility at 25°C of Cd(IO3)2 in water and in 0.20 M CdCl2.
4 answers
asked by
Andrea
2,325 views
Write the expression of for the base dissociation constant for hydrazine, N2H4, a weak base. Hydrazine reacts with water to form
4 answers
asked by
Angie
5,378 views
How do you account for the difference in volume of the solids, in terms of intermolecular bonding?
2 answers
asked by
Leeland Watson
146 views
“Green” material has high amounts of (1 point)
Responses carbon. carbon. magnesium. magnesium. phosphorus. phosphorus.
10 answers
asked by
UnicornLover36
254 views
At 25 degrees C, a sample of NH3( molar mass 17 g) effuses at the rate of .050 mole per minute. Under the same conditions, which
4 answers
asked by
Anonymous
3,395 views
In s 0.30 mol/L HNO3(aq) solution.
a) what is the concentration of nitric acid molecules. b)what is the hydroxide ion
7 answers
asked by
JM
3,434 views
Calculate the number of ions present in 7.45 grams of potassium oxide.
( At.mass of K= 39u).
6 answers
asked by
elby
7,505 views
Explain briefly how pure dry crystals of calcium chloride could be obtained from a solution of calcium chloride.
10 answers
asked by
Assan Joof
2,236 views
KMnO4 + HCl → MnCl2 + Cl2 + H2O + KCl
If the reaction occurs in an acidic solution where water and H+ ions are added to the
4 answers
asked by
Summer
1,493 views
what is the mole ratio of C5H12-> C5H8 + 2H2?
5 answers
asked by
dee
4,197 views
5 drops of 0.10M NaOH were added to 20mL of the buffer problem, the pHwent from 3.40 to 3.43. Write a net ionic equiation to
4 answers
asked by
Debbie
3,270 views
Which aqeuous solution has a freezing point closest to that of 0.30M C12H22O11?
A) 0.075M AlCl3 B) 0.15M CuCl2 C) 0.30M NaCl D)
4 answers
asked by
Vic
2,506 views
What mass of KIO3 is needed to convert the copper in 0.2750 g of CuSO4 · 5H2O to
Cu(IO3)2?
4 answers
asked by
Liam
4,336 views
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