J.R. S.

08/13/19

How to Find Empirical Formula

An unknown compound (containing only carbon and hydrogen) combusts and produces 1.60 g CO2 and 0.819 g H2O. What is the empirical formula of the compound?

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Chemistry

08/12/19

Whats the answer to the following

Calculate the percentage composition of the following:A. HgOB Na2S

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Answers •1

Chemistry Ap Chemistry

08/11/19

Calculate the concentrations of each ion remaining in solution after the precipitation is complete.

The precipitation reaction involves 75.0 mL of .0750 M solution of potassium phosphate and 75.0 mL of .0750 M iron (II) acetate.I'm very confused as to how to find the concentration of the... more

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Science Chemistry Ap Chemistry

08/11/19

Which of the following solutions of strong electrolytes contains the largest number of ions?

50.0 mL of .175 M NaOH, 100.0 mL of .250 M BaCl2, or 250.0 mL of .050 M Na3PO4?I would really appreciate if you could explain what to do in order to determine which solution contains the most... more

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Math Chemistry Physics

08/07/19

A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final... more

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Chemistry Physics

08/07/19

What type of ions are electrons colliding with to cause resistance in a circuit?

A. Metalloids B. Metallic C. Gases D. Non-metallic

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Chemistry

08/06/19

How to Find Empirical Formula

A 0.7408 g sample of a unknown compound combusted and produced 1.3203 g CO2 and 0.5405 g H2O.What is the empirical formula of this compound?

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Answers •3

Chemistry

08/06/19

Conversions of Gases in Chemistry

In the reaction 2KClO3(s) --> 2KCl(s) + 3O2(g)If 50.0 L of oxygen at STP are needed, how many gram of KClO3 must be decomposed?

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Chemistry Ap Chemistry

08/04/19

Consider the combustion of 30.0 g of propane in excess oxygen. Write the balanced molecular equation for this reaction and find the maximum mass of H2O that can form

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Algebra 2 College Algebra

08/01/19

Help solve algebra question

The radioactive substance krypton-85 has a decay rate of 6.3% per year. If you have 50 mg of krypton-85, how much will you have after seven years

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Chemistry Partition Coefficient Solvent Extraction

07/31/19

An organic compound B has a solubility of 8.0g in 200ml of water at 20°c and 20.0g in 200ml in benzene at the same temp.if 4.4g of B dissolved in 200ml of water is extracted with 200ml of benzene

Calculate Kp,calculate the amount of B left in the aqueous layer after the extraction,the amount of B left after the second extraction using 100ml benzene in each case

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Chemistry

07/31/19

A 1 liter solution contains 0.466 M nitrous acid and 0.350 M potassium nitrite. Addition of 0.175 moles of nitric acid will:

Raise the pH slightlyLower the pH slightlyRaise the pH by several unitsLower the pH by several unitsNot change the pHExceed the buffer capacity

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Biochemistry Pharmacology Toxicology

07/29/19

Are there dangers to Teflon and aluminium cookware?

I've been reading some articles on the internet about dangers of Teflon and aluminium to the body. My family say I'm just exaggerating the situation, and maybe I am, though I'm not sure because not... more

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Chemistry

07/29/19

why does non metals show variable valency?

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Chemistry

07/29/19

Consider the reaction N2(g) + 3H2(g)2NH3(g) Using the standard thermodynamic data in the tables linked above...

Consider the reactionN2(g) + 3H2(g)2NH3(g)Using the standard thermodynamic data in the tables linked above, calculate Grxn for this reaction at 298.15K if the pressure of each gas is 29.86 mm... more

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Chemistry Unit Conversion

07/28/19

Please how do I convert μmol to mg.

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Chemistry

07/26/19

Consider the reaction 4HCl(g) + O2(g)2H2O(g) + 2Cl2(g) Using the standard thermodynamic data in the tables linked above..

Consider the reaction4HCl(g) + O2(g)2H2O(g) + 2Cl2(g)Using the standard thermodynamic data in the tables linked above, calculate G for this reaction at 298.15K if the pressure of each gas... more

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Chemistry Chemical Engineering Chemical

07/26/19

Chemical Engineering

How many moles contains 6 gram of carbon? -6 moles -12moles -1/2 moles -3 moles Mole=Weight in gm/Mol. Wt

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Chemistry Chem

07/26/19

For the reaction CH4(g) + 2O2(g)CO2(g) + 2H2O(g) H° = -802.3 kJ and S° = -5.2 J/K

For the reactionCH4(g) + 2O2(g)CO2(g) + 2H2O(g)H° = -802.3 kJ and S° = -5.2 J/KThe maximum amount of work that could be done when 2.25 moles of CH4(g)react at 322 K, 1 atm is _____ kJ.Assume... more

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Chemistry

07/25/19

Consider the reaction SO2(g) + 2C(s,graphite) ---> S(s,rhombic) + 2CO(g) for which H° = 75.80 kJ and S° = 167.6 J/K at 298.15 K.

Consider the reaction SO2(g) + 2C(s,graphite) ---> S(s,rhombic) + 2CO(g) for which H° = 75.80 kJ and S° = 167.6 J/K at 298.15 K.(1) Calculate the entropy change of the UNIVERSE... more

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Chemistry Mcat Teas

07/25/19

How many grams in 3.91 moles of sodium? – Show Work How many grams in 3.91 moles of sodium? – Show Work Add answer

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Chemistry

07/24/19

Write the balanced chemical equation for the reaction below, include states, and indicate the type of reaction (S, D, C, SD, DD)

Chromium is added to aqueous iron (iii) chloride

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Chemistry

07/24/19

If there are 10.0 g of sucrose 8.0 g of oxygen how many moles of sucrose are available for this reaction

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Chemistry

07/23/19

In The APHA method to measure total iron , how to prepare calibration standards for measuring total iron if I am using the ferrous ammonium sulphate salt .Also how is the ferric Iron meaured ?

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Chemistry

07/23/19

Calculate the molar concentration

Calculate the molar concentration of the acid if 35.18mL of hydrochloric acid was required to neutralize 45.0 mL of 0.345 M aluminum hydroxide.

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How to Find Empirical Formula

Whats the answer to the following

Calculate the concentrations of each ion remaining in solution after the precipitation is complete.

Which of the following solutions of strong electrolytes contains the largest number of ions?

Physics Question Please Help!

What type of ions are electrons colliding with to cause resistance in a circuit?

How to Find Empirical Formula

Conversions of Gases in Chemistry

Consider the combustion of 30.0 g of propane in excess oxygen. Write the balanced molecular equation for this reaction and find the maximum mass of H2O that can form

Help solve algebra question

An organic compound B has a solubility of 8.0g in 200ml of water at 20°c and 20.0g in 200ml in benzene at the same temp.if 4.4g of B dissolved in 200ml of water is extracted with 200ml of benzene

A 1 liter solution contains 0.466 M nitrous acid and 0.350 M potassium nitrite. Addition of 0.175 moles of nitric acid will:

Are there dangers to Teflon and aluminium cookware?

why does non metals show variable valency?

Consider the reaction N2(g) + 3H2(g)2NH3(g) Using the standard thermodynamic data in the tables linked above...

Please how do I convert μmol to mg.

Consider the reaction 4HCl(g) + O2(g)2H2O(g) + 2Cl2(g) Using the standard thermodynamic data in the tables linked above..

Chemical Engineering

For the reaction CH4(g) + 2O2(g)CO2(g) + 2H2O(g) H° = -802.3 kJ and S° = -5.2 J/K

Consider the reaction SO2(g) + 2C(s,graphite) ---> S(s,rhombic) + 2CO(g) for which H° = 75.80 kJ and S° = 167.6 J/K at 298.15 K.

How many grams in 3.91 moles of sodium? – Show Work How many grams in 3.91 moles of sodium? – Show Work Add answer

Write the balanced chemical equation for the reaction below, include states, and indicate the type of reaction (S, D, C, SD, DD)

If there are 10.0 g of sucrose 8.0 g of oxygen how many moles of sucrose are available for this reaction

In The APHA method to measure total iron , how to prepare calibration standards for measuring total iron if I am using the ferrous ammonium sulphate salt .Also how is the ferric Iron meaured ?

Calculate the molar concentration

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