Feather

This page lists questions and answers that were posted by visitors named Feather.

Questions

The following questions were asked by visitors named Feather.

For the reaction 2H2 + 1O2 à 2H2O, there are 8.08 grams of H2 available. 2. Use the ratio of stoichiometric coefficients in the reaction above to determine how many moles of H2O can be produced from the H2 available. Then, use molar mass to convert the mo...

11 years ago

4. Suppose there are 72.0 g of O2 available, along with the 8.08 grams of H2. Use ratios of stoichiometric coefficients to find the limiting reagent for the reaction. Then, find the theoretical yield in both moles and grams. 2H2 + 1O2 à 2H2O I got 2.25 gr...

11 years ago

If 64.0 g of H2O are actually obtained, find the actual yield %. Show that the % the same whether you calculate using grams or moles. Theoretical yield is 4.04 moles and in grams is 72.80 grams 2H2 + 1O2=2H2O

11 years ago

Use solubility rules to write the balanced molecular, complete ionic, and net ionic equations for the aqueous reaction between BaI2 and Hg(NO3)2. Include phase subscripts on all substances. I got to the part where you switch the elements Ba(NO3)2 +HgI2 I...

11 years ago

Use half-cells to balance the following redox reaction, and label the oxidation and reduction half-reactions. Also, note that bromide is a spectator ion and can be eliminated. FeBr(aq) +Mg(s) = Fe(s) + MgBr2(aq) Fe^+2 -2e +Br^- e+ + Mg^+2 -2e =Fe^+2 -2e +...

11 years ago

Then, determine the final volume needed to dilute 20.0 ml of 1.00 M NaOH to 0.25 M. Next, find the volume of water which needs to be added. Finally, determine the moles and the mass in grams of NaOH in the solutions. Final volume formula is Vf= mi/mf 20 m...

11 years ago

Convert the final pressure for problem #1 into mmHg, Pa (kg/m∙s2), and kPa. Also, use 1 atm = 14.696 psi to convert to psi (pounds per square inch). Refer to conversion factors in the chapter 5 notes. Show all units and conversion factors. Final pressure...

11 years ago

3Review example 5.7 and exercise 5.7. Suppose there are 2.00 moles of O2 at 1520 mmHg and 27.0 oC. Rearrange the ideal gas law and use it to determine the volume (L) of the gas. Then, find the density by rearranging the equation P(Mm) = dRT. Show all unit...

11 years ago

Find the constants (a and b) for O2 in Table 5.7. Use the Van der Waals equation to determine the pressure of 1.000 mole of O2 if the gas occupies 22.50 liters at 27.00 oC. First, find the values for each of the two terms in the equation, then find the di...

11 years ago

Review example 5.10 and exercise 5.10. Suppose 1.58 moles of N2 and 0.420 moles of O2 occupy 22.41 L at a total pressure of 2.00 atm. Use XA = to determine the (decimal) mole fractions of both components. Then, use XA = to determine the partial pressures...

11 years ago

In some solid calcium carbonate samples, calcium bicarbonate Ca(HCO3)2. Write a balanced equation for its reaction with hydrochloric acid. CaCO3 + HCL= Ca^2+ (aq) + HCL + Ca(HCO3)2 I don't know if I have written the reactions and products correctly?

11 years ago

CaCO3 + 2H3O= Ca + 3H2O + CO2 How many moles of CaCO3 produced the moles of CO2 in the reaction?

11 years ago

1N2(g) reacts with H2(g) to form NH3(g), gaseous ammonia. Show balanced thermochemical equations based on both one mole and two moles of NH3(g). Determine Ho ( for both reactions using Table 6.2 (Hof). Use the summation equations. Show your calculations...

10 years ago

Determine the heat evolved (in kJ and in J) when 10.0 g of NH3(g) are created. Show all units and conversion factors. 10.0 gNH3 (1 mole nh3/17.0 g nh3)(-46.11 kj/1 mol nh3) = 23.11 kj -27.12 kj (1000j/1kj) -27,120 Is this correct?

10 years ago

Suppose that the 10.0 g of NH3 is formed in a bomb calorimeter, and that all of the evolved heat for the exothermic reaction is completely absorbed by the surrounding 1000 g of water. Find the change in temperature (ΔT), and the final temperature (TF) of...

10 years ago

For a photon with  = 730 nm, determine its speed, frequency, energy, and color. For frequency the formula would be v=c/lambda 3.00x10^8/7.30x10^-7=2.19x10^14/s Speed c=(v)(lambda) C=(v)(lambda) C= (2.19x10^14/s)(1.37x10^-6)=3.00x10^8 I got the wavelength...

10 years ago

Suppose an e- in an H atom has a transition from n = 3 to n = 2. a. Determine the energy of the released photon. i set it up like this Ei=-Rh/3^2 Ef=-Rh/2^2 (-Rh/9)-(-rh/4)=-4rh+9rh/36=/-rh+4rh/9/- this part why does it go to -rh+4rh? But then I got the e...

10 years ago

I am still having problems this question 2. Review Examples 7.3 and 7.4, as well as the equation for E in the chapter notes. Suppose an e−1 in an H atom has a transition from n = 3 to n = 2. a. Determine the energy (E) of the released photon. b. Convert...

10 years ago

An e−1 is released by an electron microscope at 3.00 × 106 m/s. Determine  in meters using the de Broglie relation Substitute kgˑm2/s2 for J and show all units. Then, convert  to pm and show the conversion factor. Determine the kinetic energy using EK =...

10 years ago

Determine the total possible number of orbitals and electrons for both 2s and 2p. What is the maximum number of electrons per orbital? How are their spins related? In this question i don't get how the spins are related?

10 years ago

Determine all possible values of each quantum number (n, l, ml, and ms) for electrons in both the 2s and 2p subshells. for 2s the the quantum number would be -1/2,0,1/2 right?

10 years ago

For two spin-paired electrons that are in the same orbital, describe how the values for the first three quantum numbers (n, L, and mL) are related for the two electrons. Is this because no other electron has the same quantum number?

10 years ago

Define IE, and explain why Na has a smaller value than Cl in terms of ion stability (Na+1 versus Cl+1). Would it be Na? But I can't explain why?

10 years ago

Define electron affinity, and explain why Na has a less exothermic value than Cl in terms of ion stability (Na-1) I know the definition part is Na less esothermic because Na has more energy? But why?

10 years ago

Formal charges on CH2O and H2SO3 I was taught thus way valence electrons subtracted from addition of dots plus bonds For CH2O Carbon 4-(0+3) = + 1 . Oxygen 6-(4+1) = - 1 For H2SO3 I am having issues figuring out the dots and bonds

10 years ago

Define isoelectronic series. Put the K+, Ca2+, Cl-, and Ar ions and atoms in order of increasing size and explain the trends. Count the number of electrons for each atom Then, explain the (column) size trend for Mg2+ versus Ca2+ ions Is the order cl k ca...

10 years ago

O=S=O what is this molecular structure Sulfur dioxide? It wants it's binary compound name and formula it is written this way SO2?

10 years ago

What are the relative masses of protons neutrons and electrons?

10 years ago

Determining oxidation numbers for remaining atoms in HIO3, H3PO4, Ba(OH)2, and BaPO4 I have no idea if I am doing this right I don't even know how to do this For HIO3 I added the charges as +1 and 3(-2) which i got -5 then I did it the similar way for the...

10 years ago

The heat of vaporization of ammonia is 23.4 kj/moles. How much heat is required to vaporize 1.00kg of ammonia? How many grams of water at 0 degree celcius could be frozen to ice at 0 degree celcius by evaporation of this Amount of ammonia? I got the kj by...

10 years ago

Graph g(x)= 2x+8 if x<-2 . 5-2x if -2 is less than or greater than x < 3 -2 if x is greater than or less than 3 I have to graph this and I have no idea?! Please help!!

10 years ago

Use bionomial formula to find the coefficient of the t^2 m^8 term in the expansion of (3t+m)^10. I got so far this 10C8 x 3^2 x t^2 x m^8 It tell me the next step is here =45 x 9 x t^2 x m^8 where did the 45 come from?? It doesn't explain that to me! The...

9 years ago

The point (1,0) lies on the curve y=sin(10π/x). A) if Q is the point (x,sin(10π/x), find the slope of the secant line PQ. Points are 2,1.5,1.4,1.3,1.2,1.1,0.5,0.6,0.7,0.8,0.9 Do slopes appear to be approaching a limit? There is no 10π/x on the unit circle...

9 years ago

The equation is x^2+6x+9/x^4-81 Limit is x➡️-3 I factored it out and I got 1/36 would that be right The numerator would factor out to be (x+3)(x+3) then the denominator would be (x+3)(x-3)(x+3)(x-3) this would cancel out the (x+3) which would leave 1/x^2+...

9 years ago

X^2 +6x+9/x^4-81 I put the answer as 1/36 it's not the answer?? It told me to use the identity x^4-a^4=(x+a)(x-a)(x^2+a^2) I used it, u still get the same answer....

9 years ago

Evaluate the limit (6+h)^3-216/h I think you would have expand the numerator (6+h)^3 = but how would you do it? 216+108h+h^3? It's not coming out right...

9 years ago

Lim X➡️-2. X+2/x^3+8 How do I factor out the bottom? The answer is 1/12 Would it be like this x+2/(x+2)(x-2)(x+2)??

9 years ago

(1/t√1+t - 1 /t) lim t➡️0 So far I factored out 1/t√1+t - 1/t x √1+t/√1+t I am having trouble going further

9 years ago

√1+t-√1-t/t lim -----> 0 The answer is one and I am not getting it I factored it like this √1+t-√1-t/t x √1+t-√1-t Factoring it out further I got in the numerator (1-t)(1+t) / t(√1+t+√1-t) how do you cancel further?

9 years ago

it is written as 1 in the numerator then in the denominator it is written as t√1+t this is then subtracted by 1/t lim is t----> 0 How would you factor this? Would it be by the conjugate?

9 years ago

Lim h-----> 0. (X+h)^3-x^3/h So I foiled out the numerator And I got X^3 +x^2h +2x^2h +2xh^2+h^2+h^3-x^3 So I canceled out x^3 and -x^3 Then I took out the h from the numerator to cancel out the h in the denominator and then I put in the zeros for h but I...

9 years ago

G(X) = x^2(1-2x) I have to differentiate this function I used the power and product rule G'(X)= (x^2)'(1-2x)+(x^2)(1-2x)' I got down to 2x-4x+(x^2)(-2x) 2x-6x^2 which is the answer but what do info with the extra x^2?

9 years ago

Differeniate V^3-2v√v I used the quotient rule (v)(v^3-2v√v)' -(v^3-2v√v)(v) /(v)' The answer is 2v-1-1 I got this far but then I don't know what to do further 2v^3-2v^1/2+2v√v/(v)^2

9 years ago

Brian was training to run a marathon. During the three day period before the race he decided he would train for 11 hours. If he trained for 2 3/5 hours first day and 2 9/10 second day, how many hours would he need to train third day. This is the question...

8 years ago

Answers

The following answers were posted by visitors named Feather.

2. Use the ratio of stoichiometric coefficients in the reaction above to determine how many moles of H2O can be produced from the H2 available. Then, use molar mass to convert the moles of H2O into grams. For the reaction 2H2 + 1O2 à 2H2O, there are 8.08...

11 years ago

hello just for the heck of it could you show me your way to do the limiting regent problem? this if for DRBOB

11 years ago

How come O2 is the limiting reagent ? If o2 is 2.25 and h2 is 4.04

11 years ago

Do I use the 60 ml to convert to mols and grams ?

11 years ago

60ml(0.25/.06) 0.150 mols how would I get grams

11 years ago

Thanks Steve!

10 years ago

What are the 8! Stand for? How did you get 2?

9 years ago

No the answer is 1.7321 if x = 2 then y is 1.7321 that is the answer in the back

9 years ago

X^2 +6x+9/x^4-81 I put the answer as 1/36 it's not the answer?? It told me to use the identity x^4-a^4=(x+a)(x-a)(x^2+a^2) I used it u still get the same answer....

9 years ago

No its written as 1 in the numerator then in the denominator it is written as t√1+t this is then subtracted by 1/t lim is t----> 0 How would you factor this?

9 years ago

Idon't why my phone didn't put the end part the problem is v^3-2v√v/v

9 years ago

Idon't why my phone didn't put the end part the problem is v^3-2v√v/v

9 years ago

well anonymus if ur not a cheater than how did u find the website and question hmm?

9 years ago