J.R. S.

07/22/19

Enthalpy Change Given 3 Reactions & Their Enthalpy Changes

Use the enthalpy changes given in the data below to calculate the enthalpy change for this reaction:Ca(OH)2(s) → CaO(s) + H2O(g)Data: Reaction no. Reaction ΔrH° / kJ mol-1 at 298K, standard state... more

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Chemistry

07/22/19

how to prepare 50 % saturated solution of KIO3 in water ?

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Answers •1

Chemistry

07/22/19

What is the pH of an aqueous solution that contains 0.27 mol of CH3CO2H (Ka = 1.8 x 10-5) and 0.41 mol of Na+ CH3CO2- ?

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Chemistry

07/21/19

When 18.0 mL of a 1.80×10-4 M ammonium iodide solution is combined with 18.0mL of a 7.33×10-4 M silver fluoride solution does a precipitate form?

When 18.0 mL of a 1.80×10-4 M ammonium iodide solution is combined with 18.0mL of a 7.33×10-4 M silver fluoride solution does a precipitate form? _____ (yes or no)For these conditions the Reaction... more

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Chemistry

07/21/19

When a 24.7 mL sample of a 0.500 M aqueous hydrofluoric acid solution is titrated with a 0.477 M aqueous potassium hydroxide solution, what is the pH at the midpoint in the titration?

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Chemistry Alegbra

07/21/19

general chemistry

The specific heat of a certain type of cooking oil is 0.418 cal/(g·°C). How much heat energy is needed to raise the temperature of 0.959 kg of this oil from 23.0 °C to 60.0 °C?

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Chemistry Entropy

07/21/19

Calculating Entropy Change When Burning A Substance

Calculate the entropy change from burning 65.9 g of graphite to produce gaseous carbon dioxide, using the values in the table below. Substance S0 / J... more

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Chemistry Rate Of Reaction

07/20/19

RATE OF REACTION

ZnCO3+H2SO4 --> ZnSO4+H2O+CO2The average rate of reaction is 0.638 cm3 s-1.If 0.067 g of zinc carbonate is used,what is the time taken to complete the reaction?(Molar volume of gas at room temp... more

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Chemistry

07/20/19

Chemistry 101 Calculate the freezing and boiling point

A solution is made by dissolving of nonelectrolyte solute in of benzene. Calculate the freezing point, and boiling point, of the solution.

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Chemistry

07/19/19

What volume of 0.350 M HNO3 can be made from 150mL of 6.6 M HNO3?

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Science Chemistry

07/18/19

Chem 111 help please

If 17.50mL of a NaOH solution is required to titrate a 0.4005g sample of KHP dissolved in 20mL of total solution volume, then what is the molarity of the sodium hydroxide solution? Thanks in advance!

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Science Chemistry

07/18/19

Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?

the answer can either be combustion, decomposition, replacement, or synthesis. And I didn’t really learn this and if I did I don’t remember doing this in class, can you please help me?.

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Biochemistry Microbiology Enzymes

07/17/19

Do disaccharidases require a cofactor or coenzyme to function?

I'm doing research on lactose intolerance and am curious if disaccharidases (enzymes that break down disaccharides) require a cofactor or coenzyme to function? Reviews or references would be... more

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Chemistry

07/16/19

How many grams of NO2 can be formed from the reaction between 28 grams of nitrogen and 64 gram of oxygen

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Chemistry

07/16/19

How many grams of NO2 can be formed from the reaction between 28 grams of nitrogen and 64 gram of oxygen

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Chemistry

07/15/19

The normal boiling point of acetone is 56.1 degrees Celsius and the AHvap=31.3kJ/mol. What is the vapor pressure at 25 degrees celcius

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Chemistry

07/15/19

The volume of 7.91 M HCl needed to make 196.1 mL of 2.13 M HCl is ____.

Select one:a. 52.8b. 728c. 0.198d. 3490

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Chemistry

07/15/19

How many molecules are in 2L of water vapor at STP?

I need the full equation to fully answer the question please

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Chemistry

07/14/19

If the temperature of 9.3 L of a gas at 6.5 ºC falls by 6.1 Cº, what is the new volume of the gas if the pressure is constant?

Select one:a. 9.10b. 9.29c. 0.0133d. 45.74

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Answers •2

Chemistry Organic Chemistry

07/14/19

Ideal gas graph question

How will the qualitative graph of P versus molar mass of a 1-g sample of different gases at constant volume and temperature look like?i am confused on how to derive the equation and then answer how... more

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Chemistry

07/13/19

HELP CHEMISTRY ASAP

Given the following equation:2 H2O2 (aq) → 2 H2O (l) + O2 (g) andC2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (l)The first reaction is the decomposition of hydrogen peroxide into water and oxygen gas.... more

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Chemistry Geology Percentages

07/13/19

Rock age by finding using elements and percentages

Certain element has a half life of 2.5 billion years..15% of the original element remains. The other 85% decayed into lead. How old is the rock? Analysis of another rock shows that it contains 65%... more

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Chemistry

07/13/19

How many grams of nitrogen are needed to produce 364.5 grams of ammonia gas?

Select one:a. 300b. 200c. 193d. 138

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Answers •2

Chemistry

07/13/19

If a furnace burns an amount of coal containing 198.20 g of FeS2, how much SO2 (an air pollutant) is produced?

Select one:a. 211.7b. 52.92c. 590.8d. 582.1

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Algebra 1

07/13/19

Translate the sentence into an equation The sum of 8 times a number and 2 equals 3 Use the variable b for the unknown number

Translate the sentence into an equation The sum of 8 times a number and 2 equals 3Use the variable b for the unknown number

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Enthalpy Change Given 3 Reactions & Their Enthalpy Changes

how to prepare 50 % saturated solution of KIO3 in water ?

What is the pH of an aqueous solution that contains 0.27 mol of CH3CO2H (Ka = 1.8 x 10-5) and 0.41 mol of Na+ CH3CO2- ?

When 18.0 mL of a 1.80×10-4 M ammonium iodide solution is combined with 18.0mL of a 7.33×10-4 M silver fluoride solution does a precipitate form?

When a 24.7 mL sample of a 0.500 M aqueous hydrofluoric acid solution is titrated with a 0.477 M aqueous potassium hydroxide solution, what is the pH at the midpoint in the titration?

general chemistry

Calculating Entropy Change When Burning A Substance

RATE OF REACTION

Chemistry 101 Calculate the freezing and boiling point

What volume of 0.350 M HNO3 can be made from 150mL of 6.6 M HNO3?

Chem 111 help please

Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?

Do disaccharidases require a cofactor or coenzyme to function?

How many grams of NO2 can be formed from the reaction between 28 grams of nitrogen and 64 gram of oxygen

How many grams of NO2 can be formed from the reaction between 28 grams of nitrogen and 64 gram of oxygen

The normal boiling point of acetone is 56.1 degrees Celsius and the AHvap=31.3kJ/mol. What is the vapor pressure at 25 degrees celcius

The volume of 7.91 M HCl needed to make 196.1 mL of 2.13 M HCl is ____.

How many molecules are in 2L of water vapor at STP?

If the temperature of 9.3 L of a gas at 6.5 ºC falls by 6.1 Cº, what is the new volume of the gas if the pressure is constant?

Ideal gas graph question

HELP CHEMISTRY ASAP

Rock age by finding using elements and percentages

How many grams of nitrogen are needed to produce 364.5 grams of ammonia gas?

If a furnace burns an amount of coal containing 198.20 g of FeS2, how much SO2 (an air pollutant) is produced?

Translate the sentence into an equation The sum of 8 times a number and 2 equals 3 Use the variable b for the unknown number

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