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Chemistry
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Questions (96,931)
A 2.241 g sample of nickel reacts with oxygen to form 2.852 g of the metal oxide. Calculate the empirical formula of the oxide.
1
3 answers
asked by
hannah
3,897 views
4NH3(g) + 3O2(g) -> 2N2 + 6H20, K=10^80 @ certain temp
initially, all the reactants and products have concentrations equal to
3 answers
asked by
Daniel
590 views
Gas X has a density of 2.60 g/L at STP. Determine the molar mass of
this gas.
3 answers
asked by
Josephine
1,681 views
How many grams of hydrogen gas are produced when 50.0 grams of zinc react with phosphoric acid, H3PO4 ?
Equation:3 Zn +2
4 answers
asked by
robb
1,010 views
write a balanced equation for the reaction that occurs when an aqueous solution of iron(II) chloride is mixed with an aqueous
4 answers
asked by
Lili
2,841 views
If a copper sample containing some zinc impurity is to be purified by electrolysis, the anode and the cathode must be which of
5 answers
asked by
John
3,415 views
Convert each quantity to an amount in moles:
a) 4.27 x 10^21 atoms of He b) 7.39 x 10^23 molecules of ICl
3 answers
asked by
Marty
1,474 views
5.5g of impure iron required 7.5cm3 of 3.0M HCL and give neutral solution calculate the purity of iron
3 answers
asked by
Pilly
135 views
O is a dibasic acid H2X .G is a solution containing 1.00g of NaOH in 250cm³ solution.
1) calculate the concentration of G in
3 answers
asked by
Lisa
438 views
Chemical Reaction System Unit Test
Use the dissociation reaction to answer the question. Fe SCN2+(aq) = Fe3+(aq) + SCN- (aq) in
6 answers
asked by
Rina
1,183 views
How many milliliters of stock solution of 2.00 M KNO3 would you need to prepare 100.0 ml of .20 M KNO3 solution? Please show
3 answers
asked by
J_Yeary
1,184 views
how many atoms are there in 3(NH4)2SO4 ?
3 answers
asked by
cherry
875 views
Calculate the pH and the poH 0.0035moldm-3 H3 PO4 solution
3 answers
asked by
Ayomide
389 views
a piece of Aluminium weighing 2.7g is titrated with 75 mL of H2SO4(specific gravity 1.18 and 24.7% H2SO4 by weight). after the
4 answers
asked by
glorious
2,637 views
When the following solutions are mixed together, what precipitate (if any) will forms? Write the reaction equation for all the
3 answers
asked by
Jordan
1,483 views
An impure sample of (COOH)2 ·2 H2O that
has a mass of 3.4 g was dissolved in water and titrated with standard NaOH solution. The
4 answers
asked by
lois
2,723 views
After 20.0g of Na2SO4 is added to a 0.5L saturated solution of CaSO4, does the concentration of Ca2+ increase, decrease, or stay
3 answers
asked by
Alondra
2,736 views
I was doing a lab experiment on the reaction of copper(II) sulphate and aluminum:
1) I measured 2.02g of copper(II) sulphate
4 answers
asked by
Patrick
1,892 views
Aqueous potassium phosphate was mixed with aqueous magnesium chloride, and a crystallized magnesium phosphate product was
4 answers
asked by
Beverly
7,574 views
1. Calculate the concentration of H3O+, HC2O4-1, and oxalate ion (C2O42-) in a 0.175 M solution of oxalic acid (C2H2O4).
[For
3 answers
asked by
Anonymous
2,819 views
The standard enthalpy of formation of H2O (l) is -285.8 kJ/mol. Calculate ∆E° for the following
reaction. H2O (l) → H2 (g) +
3 answers
asked by
Mahnoor
1,218 views
Write the balanced molecular equation for the reaction between lithium phosphate and calcium nitrate.
3 answers
asked by
Anonymous
3,470 views
Please help!
Calculate the standard change in enthalpy, ΔH°rxn, for the decomposition of calcium carbonate to calcium oxide
3 answers
asked by
Jane
3,445 views
Show the half equations at the anode and cathode for an electrolysis of concentrated magnesium chloride solution using inert
3 answers
asked by
Eddie
734 views
the metal gold, with an atomic radius of 144.2pm crystallizes in a face-centered cubic lattice. what is the density of gold?
4 answers
asked by
Anonymous
1,615 views
if 0.896 grams of a gas occupies a 250 ml flask at 20 degrees celcius and 760 mm hg of pressure,what is the molar mass of the
5 answers
asked by
albius
530 views
The equilibrium constant, Kc, for the equilibrium
N2O4(g)←→2NO2(g) is 4.6×10−3 . If the equilibrium mixture contains
4 answers
asked by
Anonymous
1,749 views
Calculate the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution.
Ka =
5 answers
asked by
Jake
1,452 views
the volume of a gas was originally 2.5 L; it's pressurewas 104kpa and its temperatire was 270K. the volume of the gas expanded
4 answers
asked by
ed
993 views
1.)A sample of oxygen took 55 seconds to travel a certain distance. How long would it take for the same number of moles of
4 answers
asked by
Bryan
887 views
A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-]
3 answers
asked by
DAN
984 views
calculate the theorectical yield of the compounds to be prepared in the experiment. The metal ion in both cases is the limiting
4 answers
asked by
Debbie
2,276 views
Nitrogen dioxide decomposes at 300°C via a second-order process to produce nitrogen 14) monoxide and oxygen according to the
4 answers
asked by
Maylen
4,136 views
In one trial of an investigation 50.0 mL of HCl(aq) of an unknown concentration is Tiresias with 0.10M NaOH (aq). During the
3 answers
asked by
Kelly
1,525 views
Calculate the pH of a 0.250M solution of Sulfurous acid, H2SO3.
4 answers
asked by
Josh
2,281 views
A 35.0 mL sample of 0.150 M acetic acid is titrated with 0.150 M NaOH solution. Calculate the pH after the following volumes of
4 answers
asked by
Anonymous
1,758 views
Identify the solvent and the solute in vinegar, a dilute aqueous solution of acetic acid.
3 answers
asked by
Danny
2,657 views
Suppose that two hydroxides, MOH and M'(OH)2, both have Ksp = 1.0 10-12 and that initially both cations are present in a
4 answers
asked by
Val
2,151 views
A gas that occupies a volume of 6.75L at 89.0atm will occupy what volume at 68.55mm Hg if the temperature remains constant?
(89.0
3 answers
asked by
Shannon
1,652 views
What is the (name of the) molecular structure of AlCl3NH3 ?
4 answers
asked by
Inga
942 views
How many grams of dry NH4Cl need to be added to 1.80L of 0.200M solution of ammonia,NH3, to prepare a buffer that has a pH of
5 answers
asked by
Jennifer
1,566 views
When setting up their experiment, a student discovered that the solution in their flask turned bright pink upon adding 2 drops
4 answers
asked by
Lilit ***
1,207 views
Hydrazine, N2H4, is a colorless liquid used in rocket fuel. What is the enthalpy change for the process in which hydranzine is
3 answers
asked by
Austin
3,559 views
A 3.0 molal solution of naphthalene in cyclohexane boils at 89.4 C. What is the boiling point of pure cyclohexane? Although
3 answers
asked by
Grace
1,063 views
The chains that ultimately form plastic are known as:
Monomers Polymers Oil and gas molecules Plastic fibres
3 answers
asked by
no
164 views
255 grams of octane and 1510 grams of oxygen gas are present at the beginning of reaction that goes to completion and forms
2 answers
asked by
Keby
160 views
Assuming titration was carried out between sodium hydrogen tetraoxosulphate (vi)(NaHSo) of concentration 12.0gdm-² as solution
3 answers
asked by
Adedapo Felix
276 views
How many moles of P2O5 contain 3.68*1025 phosphorus atom? The
molar mass of P2O5 is 283.89 g/mol.
5 answers
asked by
moly
267 views
5.0g of calcium carbonate were allowed to react with 25cm3 of 1.0M hydrochloric acid
Until there was no further reaction.
3 answers
asked by
Freddy
420 views
Is Na2O2 (sodium peroxide) a polar or non polar? Also, what the electronegativity of the following compounds: H2SO4, HNO3, NA2O2
3 answers
asked by
Sky
618 views
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