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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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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02/06/24

Liter Word Problem
How many liters would 3,238.6 moles of N20 occupy at 40 C?
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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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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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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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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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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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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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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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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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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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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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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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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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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.
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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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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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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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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02/02/24

How many ATOMS of nitrogen are present in 1.68 moles of nitrogen trifluoride? atoms of nitrogen

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02/02/24

How many MOLES of oxygen are present in 3.87 grams of water ? moles.
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02/02/24

How many GRAMS of hydrogen are present in 3.17 moles of water ? grams.
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02/02/24

Rate Constant for First Order Reactions
Time(min) 0 60 90 300 600 [N2O][N2O] 0.250 0.228 0.216 0.128 0.0630 What is the value of the rate constant for the consumption of N2ON2O, given that this reaction is first order?
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02/01/24

Molar Mass Determination from freezing point
If I have calculated the freezing point using the cooling curve on excel (took the line of best fits from the initial temperature and plateau and set equal to each-other and solved). How can I now... more
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02/01/24

If N2 + 3H2 -> 2NH 3, how much H2 is needed to react with 15g of N2?
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