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Chemistry

02/07/24

Balancing Equations and Stoichiometry

You burn some acetylene, C2H2, according to the unbalanced reaction. C2H2 + O2 —> CO2 + H2O. A) How many grams of acetylene would be required to produce 63 L of CO2 gas at 1000 C?B) How many... more

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Chemistry

02/06/24

Suppose you separate a 2.65 g mixture of sand and salt and recover 1.20 g of salt. What is the percent by mass of salt in the mixture?

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Chemistry

02/06/24

Chemistry questions

What is the mass of sodium chloride used to create a 250 mL solution at a concentration of 3.5 M? To earn credit, your solution must include a step-by-step solution with units included throughout... more

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Chemistry

02/06/24

How to find the pH of the buffer solution when initiai pH=7 strength=0.1,volume=1L when 100ml of 1M phosphoric acid is added given(pka1=2.15,pka2=7.20,pka3=negligible) by the concept of ICE?

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Chemistry

02/06/24

Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 0.650 kg of water decreased from 101 °C to 49.0 °C.

Property Value Units Melting point 0 °C Boiling point 100.0 °C ΔHfus 6.01 kJ/mol ΔHvap 40.67 kJ/mol cp (s) 37.1 J/mol · °C cp (l) 75.3 J/mol · °C cp (g) 33.6 J/mol · °C

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Chemistry

02/06/24

Liter Word Problem

How many liters would 3,238.6 moles of N20 occupy at 40 C?

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Chemistry

02/05/24

Ideal Gas Law Problem

What pressure would be exerted by 12 moles of gas at 330 C and a volume of 600 cm3?

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Chemistry

02/05/24

Gas Stoichiometry Word Problem

Diesel fuel produces 10.17 kg CO2 for every gallon burned. If a semi truck averages 6 miles per gallon of diesel, how many liters of CO2 will it generate over a 1000 mile trip through Death Valley,... more

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Chemistry

02/05/24

Chemistry Word Problem

Calculate the pH and concentrations of ch3nh2 and ch3nh3+ in a 0.0349 M methylamine (ch3nh2) solution. the Kb of ch3nh2 is 4. 47×10−4.

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Chemistry

02/05/24

The green light emitted by a stoplight has a wavelength of 533 nm. What is the frequency of this photon? (c = 3.00 × 10⁸ m/s).

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Chemistry Math

02/04/24

Chemistry Dimensional Analysis 9 Part question

1.Density is defined as the ratio between a substance's mass and volume. The density of gold is 19.3 g/mL. Explain how density can be used as a conversion factor. What two physical properties of... more

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Chemistry

02/04/24

Calculate the pH of a solution obtained by mixing 127.53 mL of 0.16 M CH3COOH with 10.13 mL of 0.1 M NaOH.

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Chemistry

02/04/24

Compare the solutions of 0.50 M NaCl and 0.50 M sucrose (i=1) with the following parameters. a. Which solution has the higher boiling point. b. Which solution has the higher freezing/melting point.

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Chemistry

02/03/24

At what temperature does the following reaction become spontaneous? You may assume that ΔHº and Sº are temperature independent.

At what temperature does the following reaction become spontaneous?You may assume that ΔHº and Sº are temperature independent.2NO (g) + 2H2(g) --> N2(g) + 2H2O (g)I have the values for H and S,... more

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Chemistry

02/03/24

Using the appropriate thermodynamic values in the table below, calculate the lowest temperature at which the reaction is spontaneous under standard conditions.

A mixture of CO(g) and H2(g) is produced by passing steam over hot charcoal:Using the appropriate thermodynamic values in the table below, calculate the lowest temperature at which the reaction is... more

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Chemistry

02/03/24

From this value and the values of the standard free-energy of formation of liquid ethanol, acetic acid, and water, calculate ΔG°f for ethyl acetate.

The standard free-energy change in the reaction of water with ethyl acetate (CH3CO2C2H5) to give ethanol (C2H5OH) and acetic acid (CH3COOH) is –19.7 kJ. From this value and the values of the... more

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Chemistry

02/03/24

At what temperature does the following reaction become spontaneous?

At what temperature does the following reaction become spontaneous?You may assume that ΔHº and Sº are temperature independent.2NO (g) + 2H2(g) --> N2(g) + 2H2O (g)

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Chemistry

02/03/24

Using standard the thermodynamic properties shown below estimate the normal boiling point of carbon disulfide (CS2).

Using standard the thermodynamic properties shown below estimate the normal boiling point of carbon disulfide (CS2) in C. Molar Mass (g/mol) ΔHof (kJ/mol) So... more

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Chemistry

02/02/24

Determining Energy available from combustion

We are trying to find out the Energy available from combustion of different sources of fuels. How do you calculate that?

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Chemistry

02/02/24

A solution of 7.50 mg of a small protein in 5.00 mL aqueous solution has an osmotic pressure of 5.15 torr at 23.1°C.

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Chemistry

02/02/24

Use the balanced equation, 2H2 + O2 ------> 2H2 O to determine how many moles of hydrogen gas would be required to produce 25 moles of H2 O.

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Chemistry

02/02/24

How many representative particles of NF3 are formed when 30 L of N2 at STP is consumed in the following reaction? N2 + 2F3 ------> 2NF3

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Chemistry Science

02/02/24

The activation energy for the diffusion of carbon in coper is

The activation energy for the diffusion of carbon in copper is 200,000 J/mol. Calculate the diffusion coefficient in Å2/s at 300°C, given that the diffusion coefficient at 1000°C is... more

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Chemistry

02/02/24

How many MOLES of carbon dioxide are present in 5.29×10^22 molecules of this compound ?

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Chemistry

02/02/24

How many MOLECULES of carbon dioxide are present in 2.71 moles of this compound ?

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Balancing Equations and Stoichiometry

Suppose you separate a 2.65 g mixture of sand and salt and recover 1.20 g of salt. What is the percent by mass of salt in the mixture?

Chemistry questions

How to find the pH of the buffer solution when initiai pH=7 strength=0.1,volume=1L when 100ml of 1M phosphoric acid is added given(pka1=2.15,pka2=7.20,pka3=negligible) by the concept of ICE?

Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 0.650 kg of water decreased from 101 °C to 49.0 °C.

Liter Word Problem

Ideal Gas Law Problem

Gas Stoichiometry Word Problem

Chemistry Word Problem

The green light emitted by a stoplight has a wavelength of 533 nm. What is the frequency of this photon? (c = 3.00 × 10⁸ m/s).

Chemistry Dimensional Analysis 9 Part question

Calculate the pH of a solution obtained by mixing 127.53 mL of 0.16 M CH3COOH with 10.13 mL of 0.1 M NaOH.

Compare the solutions of 0.50 M NaCl and 0.50 M sucrose (i=1) with the following parameters. a. Which solution has the higher boiling point. b. Which solution has the higher freezing/melting point.

At what temperature does the following reaction become spontaneous? You may assume that ΔHº and Sº are temperature independent.

Using the appropriate thermodynamic values in the table below, calculate the lowest temperature at which the reaction is spontaneous under standard conditions.

From this value and the values of the standard free-energy of formation of liquid ethanol, acetic acid, and water, calculate ΔG°f for ethyl acetate.

At what temperature does the following reaction become spontaneous?

Using standard the thermodynamic properties shown below estimate the normal boiling point of carbon disulfide (CS2).

Determining Energy available from combustion

A solution of 7.50 mg of a small protein in 5.00 mL aqueous solution has an osmotic pressure of 5.15 torr at 23.1°C.

Use the balanced equation, 2H2 + O2 ------> 2H2 O to determine how many moles of hydrogen gas would be required to produce 25 moles of H2 O.

How many representative particles of NF3 are formed when 30 L of N2 at STP is consumed in the following reaction? N2 + 2F3 ------> 2NF3

The activation energy for the diffusion of carbon in coper is

How many MOLES of carbon dioxide are present in 5.29×10^22 molecules of this compound ?

How many MOLECULES of carbon dioxide are present in 2.71 moles of this compound ?

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