J.R. S.

02/11/20

Van't hoff factor, solvent and solute

1. I add a non-volatile solute to a pure solvent to form a solution. Will the vapor pressure of this newly formed solution be lower than that of the pure solvent at the PURE SOLVENT's normal... more

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Chemistry

02/11/20

How much value (in L)

How much value (in L) will 8,427 DF of a substance having a density of 1.31 g/mL occupy

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Chemistry Organic Chemistry

02/11/20

arrange the elements in order of increasing electronegativity. B, O, Al, H. Please explain.

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Chemistry

02/10/20

Basic chemistry

What volume of NH3 will appear (stp) after reaction of 13,2 grams of NH42SO4 and 5,6 grams of KOH?

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Chemistry

02/10/20

Help with these chemistry questions in the description please.

These relate directly to the model of electron structure known as Quantum Mechanics. If anybody could answer the questions below it’d be great thanks. State the maximum number if electrons that can... more

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Chemistry

02/10/20

How do I calculate liters of CO2 at stp

How do I calculate liters of CO2 at stp from 1,995,852 g of octane

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Chemistry

02/10/20

Complete, net, and condensed equations

write the condensed, complete, and net ionic equations for any reaction that occurs between K2CrO4(aq) and Fe(NO3)3(aq).

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Chemistry

02/09/20

If there are 1.60 moles of H , how many moles of each of the compounds are present

H2SO4:C2H4O2:NaOH

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Math Chemistry Algebra

02/07/20

Round off each of the following numbers to 3 significant figures

A) 397.48B) 145,620C) 0.008602D) 1955

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Chemistry

02/06/20

56.0 mol of P4O10 contains how many moles of P ?

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Chemistry

02/05/20

Chemistry molar mass help

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent.When 0.950 g of quinine is dissolved... more

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Chemistry

02/05/20

Mass of each component question

In a 69.0-g aqueous solution of methanol, CH4O, the mole fraction of methanol What is the mass of each component?the correct answer for mass of water is 41.6. Just can't figure out mass of methanol.

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Chemistry

02/04/20

DeltaH= -196.0 kJ/mol, DeltaS=125.9 J/mol •k and T is 25°C

2H2O2(l) = 2H2O(l) + O2(g)spontaneous yes or no

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Chemistry

02/04/20

Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.

A Se ion has a mass number of 75 and a charge of −2 . Determine the number of neutrons, protons, and electrons in this ion.An ion has a mass number of 65, 36 neutrons, and a charge of +1 . Identify... more

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Chemistry

02/03/20

please help with my chemistry!

A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 80.0 mL. The liquid solvent has a mass of 38.7 g and a density... more

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Chemistry

02/03/20

please help with my chemistry!

A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 80.0 mL. The liquid solvent has a mass of 38.7 g and a density... more

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Chemistry

02/03/20

Calculate mercury's density if a sample of mercury is found to have a mass of 409.0 g and a volume of 30.68 mL

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Chemistry

02/03/20

Molarity converstions with ions

A student prepares a solution by placing 0.387 g of NiSO4 · 6H2O and 0.123 g of NiCl2 · 6H2O in a 250-mL volumetric ﬂask. A small amount of distilled water is then added, and the compounds are... more

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Chemistry

02/03/20