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tomi
Questions and answers by visitors named
tomi
Questions (53)
Determine the number of moles of
a) N atoms in 42.5g of Mg(NO3)2 b) N atoms in a sample of C7H5(NO2)3 that has the same number of
4 answers
670 views
To determine the approximate mass of a small spherical shot of copper, the following experiment is performed. When 140 pieces of
4 answers
1,834 views
Determine the number of moles of
N atoms in a sample of C7H5(NO2)3 that has the same number of O atoms as 12.6g C6H12O6
4 answers
1,053 views
Determine the number of moles of
a) N atoms in a sample of C7H5(NO2)3 that has the same number of O atoms as 12.6g C6H12O6
7 answers
2,656 views
A gaseous mixture of O2 and N2 contains 32.8% nitrogen by mass
How do i figure out wat the mass is?
4 answers
1,271 views
A 2.34L container of H2(g)at 752mmHg and 24 degrees is connected to a 3.17L container of He(g) at 717mmHg and 24 degrees.
After
1 answer
464 views
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What
3 answers
725 views
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What
3 answers
756 views
The combustion of hydrogen–oxygen mixtures is used to produce very high temperatures (approximately 2500 °C) needed for
4 answers
2,513 views
Calculate the standard enthalpy change for the reaction
2A+B->2C+D Use the following data: Substance A=-257kj/mol B=-413kj/mol
4 answers
2,407 views
The complete combustion of butane, (g) is represented by the equation
C4H10+ 13/2O2->4CO2+5H2O standard enthalpy is -2877kj How
3 answers
2,004 views
The complete combustion of butane, (g) is represented by the equation
C4H10+13/2O2->4CO2+5H20 STANDARD ENTHALPY IS -2877KJ/MOL
3 answers
1,593 views
A calorimeter contains 16.0ml of water at 15.0degrees celsius. When 1.60g of X(a substance with a molar mass of 46.0g/mol) is
2 answers
954 views
Zinc dissolves in acid according to the balanced equation.
Zn(s)+ 2H(aq)-> Zn(aq) + H2(g) a sample of zinc is placed in a ice
2 answers
545 views
Zinc dissolves in acid according to the balanced equation.
Zn(s)+ 2H(aq)-> Zn(aq) + H2(g) a sample of zinc is placed in a ice
2 answers
594 views
Zinc dissolves in acid according to the balanced equation.
Zn(s)+ 2H(aq)-> Zn(aq) + H2(g) a sample of zinc is placed in a ice
2 answers
610 views
How much energy, in joules, must be absorbed to convert to Na all the atoms present in 1.00mg of gaseous Na? The first
4 answers
6,174 views
What electron transition in a hydrogen atom, starting from the orbit 10, will produce infrared light of wavelength 3040 ?
3 answers
901 views
a mixture is prepared using equal masses of two volatile liquid benzene, C6H6 and ethanol C2H5OH. what is the mole fraction of
4 answers
546 views
a compound containing only boron, nitrogen and hydrogen was found to be 40.3% B, 52.2%N, and 7.5% H by mass. If 3.301g of this
3 answers
834 views
a compound containing only boron, nitrogen and hydrogen was found to be 40.3% B, 52.2%N, and 7.5% H by mass. If 3.301g of this
3 answers
820 views
Draw the electron-dot structure for CHClO.
4 answers
797 views
The average bond enthalpy for a C=C double bond is 614kj/mol and that of a C-C single bond is 348kj/mol . Estimate the energy
3 answers
1,818 views
Use bond energies to estimate the enthalpy change for the following reaction
C2H2 + H2-> C2H4 i figured the bonds broken are: 1 C
4 answers
2,696 views
What is the longest wavelength of light that will provide photons of sufficient energy to break the pi bond and cause the
4 answers
6,087 views
What is the longest wavelength of light that will provide photons of sufficient energy to break the pi bond and cause the
2 answers
489 views
The normal boiling point of water is 100.00 degrees celsius and the enthalpy of vaporization at this temperature is
2 answers
576 views
What is the boiling point of water at an elevation of 1.55×10^4 ft ?
The atmospheric pressure at sea level is 760mmHg . This
3 answers
1,621 views
i have to catogerize the list based on which is ionic, polar covalent, and nonpolar covalent
1.SI 2.HBr 3.HP 4.SO 5.BeF 6.BeCl
2 answers
502 views
"context affects content"
what does this mean
3 answers
374 views
If the last value of Period is less than the number of periods specified in the Parameters worksheet, increment the Period value
1 answer
366 views
A student placed 12.5 of glucose () in a 100.- volumetric flask, added enough water to dissolve the glucose by swirling, then
2 answers
926 views
A student placed 12.5 of glucose (C6H12O6) in a 100ml volumetric flask, added enough water to dissolve the glucose by swirling,
3 answers
1,618 views
The enzyme Y catalyzes the elementary reaction
AB-->A + B An enzyme concentration of 1.0M Y can convert a maximum of 0.5M AB to
4 answers
2,799 views
A solution is prepared by dissolving 10.00g of a monobasic salt in a total volume of 1.00litres. Th pH of this solution was
1 answer
453 views
A solution is prepared by dissolving 10.00g of a monobasic salt in a total volume of 1.00litres. Th pH of this solution was
1 answer
428 views
A solution is prepared by dissolving 10.00g of a monobasic salt in a total volume of 1.00litres. Th pH of this solution was
1 answer
482 views
The pH of saturated Sr(OH)2 is found to be 13.12. A 15.0ml sample of saturated Sr(OH)2 is diluted to 250.0ml in a volumetric
4 answers
1,418 views
The following reaction is used in some self-contained breathing devices as a source of O2.
4KO2(s) + 2C02(g)---> 2K2CO3(s) +
1 answer
761 views
Lead metal is added to 0.140M Cr^+3(aq).
Pb(s)+ 2Cr^3+(aq)---> Pb^2+(aq) + 2Cr^2+(aq) a)What is [Pb^2+] when equilibrium is
1 answer
445 views
Lead metal is added to 0.140M Cr^+3(aq).
Pb(s)+ 2Cr^3+(aq)---> Pb^2+(aq) + 2Cr^2+(aq) a)What is [Pb^2+] when equilibrium is
2 answers
504 views
The following equation describes the oxidation of an acidified solution of sodium oxalate (Na2C2O4) by potassium
5 answers
886 views
Calculate [H3O] in the following solutions.
a)4.0×10−2M HCl and 8.0×10−2M HOCl b)0.105M NaNO2 and 5.00×10−2M HNO2
3 answers
1,429 views
Calculate [H3O] in the following solutions.
5.15x10-2M HCl and 7.62x10-2M NaC2H3O2 Responses HCl + NaC2H3O2. It appears there is
5 answers
1,740 views
A sample of 7.80L of NH3(ammonia) gas at 22 degrees Celsius and 735torr is bubbled into a 0.350L solution of 0.400M HCl
3 answers
750 views
You are asked to bring the pH of 0.500L of 0.450M NH4Cl to 7.00.
a) Which of the following solutions would you use: 10.0M HCl or
1 answer
658 views
A 75.0mL sample of 1.56×10−2M Na2SO4(aq) is added to 75.0mL of 1.22×10−2M of Ca(NO3)2(aq).
What percentage of the Ca+
2 answers
1,130 views
A sample of 7.80L of NH3 (ammonia) gas at 22 degrees and 735mmHg is bubbled into a 0.350L solution of 0.400M HCL(hydrochloric
1 answer
826 views
You are asked to bring the pH of 0.500L of 0.450M NH4Cl to 7.00.
a) Which of the following solutions would you use: 10.0M HCl or
4 answers
702 views
A 75.0mL sample of 1.56×10−2M Na2SO4(aq) is added to 75.0mL of 1.22×10−2M of Ca(NO3)2(aq).
What percentage of the Ca+
3 answers
813 views
A sample of 7.80L of NH3 (ammonia) gas at 22 degrees and 735mmHg is bubbled into a 0.350L solution of 0.400M HCL(hydrochloric
3 answers
3,722 views
If you were to use an aquatic plant for your starting material, what would you expected to see in terms of pigments and
3 answers
430 views
1.Pippete 20ml of 0.1M acetic acid and 20ml of 0.1M NaOH into a 100ml beaker (Remember that the final volume of this solution is
2 answers
622 views
