# FWS

### How to justify ?

Predict the driving force to produce nitrogen monoxide, NO (more spontaneous or less spontaneous) in which ΔG° for this reaction changes with the increase of temperature.

Chemistry1 week ago### Calculate the heat of reaction for the burning process?

When 2.84 g of ethanol C2H5OH is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25 °C to 33.73 °C. The heat capacity of the calorimeter is measured to be 9.63 kJ/ °C.

1 AnswerChemistry1 week ago### How to find the magnitude and direction of the net electric force they will exert on the proton?

If two electrons are each 1.8x 10-10 m from a proton, as shown in Fig. 1.4.

1 AnswerPhysics4 weeks ago### How to do a and b?

Two particles having charge of +0.540 nC and +8.64 nC are separated by a distance of 1.90 m.

(a) At what point along the line connecting the two charges is the net electric field due to the two charges equal to zero?

(b) Where would the net electric field be zero if one of the charges were negative?

1 AnswerPhysics4 weeks ago### Find the magnitude and direction of the net electric force they will exert on the proton.?

If two electrons are each 1.8x 10-10 m from a proton, as shown in Fig. 1.4.

1 AnswerPhysics4 weeks ago### What is the magnitude and sign of q1 if the net force on q3 is zero?

Three-point charges are arranged on a line. Charge q3= +5.00 nC is at origin. Charge q2= -3.00 nC is at x= +4.00 cm. charge q1= is at x=+2.00 cm.

1 AnswerPhysics4 weeks ago### How many electrons are missing from each ion?

When two identical ions are separated by a distance of 6.2 x 10^−10 m, the electrostatic force each exerts on the other is 5.4 x 10^−9 N.

1 AnswerPhysics4 weeks ago### What are the magnitude and direction of the force each charge exerts on the other?

Two equal point charges of +3.1x 10^-6 C are placed 0.190 m apart.

1 AnswerPhysics4 weeks ago### What was its initial temperature ?

A 0.350 L solution is prepared by dissolving 0.598 g of MgCl2 in water. The enthalpy of solution for MgCl2 is ∆H = -81.5 kJ/mol. If the final temperature of the solution is 35 oC, what was its initial temperature? (Assume that the density of solution is 1.00 g/mL, specific heat capacity is 4.18 J/g.K and the solution loses no heat to its surroundings)

Chemistry4 weeks ago### Calculate the Molarity of the solution and mass of benzene in the sample?

Several years ago, millions of bottles of mineral water were contaminated with benzene at ppm levels. A 250-mL sample of mineral water has 12.7 ppm of benzene. Assuming that the contaminated mineral water is a very dilute aqueous solution, its density is 1.00 g mL–1.

1 AnswerChemistry4 weeks ago### Calculate the [Ag+] and [CO3 2-] in the solution at equilibrium when 6 mL of 0.1 M Na2CO3 are mixed with 3 mL of 0.5 M AgNO3?

The solubility product constant of Ag2CO3 is 8.1x10^-12 at 25'C. By constructing the ICE table, calculate the [Ag+] and [CO32-] in the solution at equilibrium when 6 mL of 0.1 M Na2CO3 are mixed with 3 mL of 0.5 M AgNO3.

1 AnswerChemistry4 weeks ago### Give at least three examples of properties of a solution that depend on the concentration?

Give at least three examples of properties of a solution that depend on the concentration, but not the type of particle presents as solute.

2 AnswersChemistry1 month ago### Calculate the solubility of calcium fluoride in a 0.020 M fluoride solution.?

The solubility product constant for calcium fluoride is 1.7 × 10^-10.

1 AnswerChemistry1 month ago### Calculate the molarity, mass percent, mole fraction and molality of ethanol in this solution.?

A solution is prepared by mixing 1.00 g ethanol (C2H5OH) with 100.0 g water to give final volume of 101 mL.

Chemistry1 month ago### Determine the following properties of the solution?

A 0.944 M solution of glucose, C6H12O6, in water has a density of 1.0624 g/mL at 25°C. Given that the molal freezing-point-depression constant (Kf) for water is 1.86°C/m and vapor pressure of pure water at 25°C is 23.8 torr, determine the following properties of the solution:

a. Mole fraction of H2O, X waterb. Vapour pressure (torr), P solnc. Freezing point (°C), Tf

1 AnswerChemistry1 month ago### Determine whether there is precipitate or no precipitate in the solution?

Given Ksp of CaSO4 is 2 × 10^-5, Determine whether there is precipitate or no precipitate in the solution containing 10 cm^3 of 0.01 mol dm^-3 Ca(NO3)2 and 10 cm^3 of 0.01 mol dm^-3 H2SO4? Use M1V1 = M2V2 and Qsp

1 AnswerChemistry1 month ago### Which substances is more likely to dissolve?

Predict whether each of the following substances is more likely to dissolve in the nonpolar solvent carbon tetrachloride (CCl4) or in water (H2O).

a. C7H16

b. Na2SO4

c. HCl

d. I2

1 AnswerChemistry1 month ago### How to do for this two questions?

1.Explain in your words about how gravitational force works between two isolated objects and use this understanding to explain how a satellite can remain at the same place above the surface of the rotating earth.

2. In an experiment to study Hooke's law for solid material, the extension for three different wires A, B and C were obtained for various applied force as shown in TABLE Q3b.

a.Consider all the extensions were within the elastic limit. Draw graph of extension against force for each wire and use it to identify which of the wires requires the most work done to extend to 3.8 mm.

b.Determine the elastic modulus of each wire and arrange them according to their stiffnesses.

1 AnswerPhysics2 months ago### How to solve 1 and 2?

A great pianist is getting ready for his concert and plan to move his exclusive grand piano to his concert venue. The 700 kg piano needs to be loaded onto a truck bed which is about 1.5 m high.

1.Initially, the movers decide to use an adjustable ramp to move the piano. The ramp can only be adjusted up to 10 m long and the inclination angle must not exceed 20° to ensure a safe loading process. Determine the range of a suitable length and angle of the ramp.

2.On a second thought, the movers are considering whether it is easier to lift the piano straight up onto the truck bed or push it up along the rough the ramp. With the aid of an appropriate free body diagram, justify the most efficient option for the movers to load the piano to the truck bed with constant speed. State clearly all the assumptions made, and the principles used in the calculations to support your answers.

1 AnswerPhysics2 months ago