11/17/20

Knowing that ∆Hvap for water is 40.7 kJ/mol, calculate Pvap of water at 37°C
I had gotten the answer 6.90 torr, but the correct one says ita 52.6 torr.. Confused about what I had done wrong!
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11/17/20

Determine the theoretical yield of urea Express your answer using four significant figures.
Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH3) with carbon dioxide as follows:2NH3(aq)+CO2(aq)→CH4N2O(aq)+H2O(l)In an industrial synthesis of urea, a... more
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11/17/20

i need help on this question

Electron dot diagrams are drawn by surrounding the element symbol with the correct number of... a. protons that the atom has. Selected:b. electrons that the atom has.This answer is incorrect. c.... more
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11/17/20

What is the electron configuration for the element titanium?
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11/17/20

What is the electron configuration for the fluoride ION?
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11/17/20

se the table above to find the average atomic mass of strontium. You must show your work step-by-step to earn credit.
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11/17/20

Why are electrons not used the calculate the atomic mass of elements?
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11/17/20

Consider the reaction: CO (g) + 2 H2 (g) ------ CH3OH (g)
Suppose that 16.5 L of CO (g) is allowed to react with 25.2 L of H2 (g) at constant temperature and pressure. What volume of CH3OH gas would be produced?
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11/17/20

Consider the following reaction: 2K2O(s) + 2Cl2(g) -----4 KCl (s) + O2(g).
If 5.00 g of K2O reacts completely with excess water: a. What volume of O2 gas will be collected at STP? b. If all the O2 gas is collected in a 0.500 L metal cylinder at 37.0˚C, what pressure will... more
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11/17/20

Calculate the concentration of buffer components present in 293.00 mL of a buffer solution that contains 0.430 M NH4Cl and 0.430 M NH3 immediately after the addition of 1.60 mL of 6.00 M HNO3.
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11/17/20

If I have a 12% solution of hydrogen peroxide (2 cups) and dilute it with 1 cup water, what is the new percentage?
I'm actually doing a lab, this isn't a textbook problem (college bio)
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11/16/20

Enthalpy of formation
A scientist measures the standard enthalpy change for the following reaction to be -716.4 kJ:2NH3(g) + 2 O2(g)N2O(g) + 3 H2O(l)Based on this value and the standard enthalpies of formation for the... more
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11/16/20

Ideal Gas Laws: Molar Mass And Density
Uranium hexafluoride is a solid at room temperature, but it boils at 56°C. Determine the density of uranium hexafluoride at 70.°C and 747 torr.Density= g/L
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11/16/20

Calculate the mass percent (m/m) for the solute in each of the following solutions.
a) 61 g of NaOH in 329 g of NaOH solutionb) 3.5 g of KOH and 30.5 g of H2Oc) 50.5 g of Na2CO3 in 253.0 g of Na2CO3 solution
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11/16/20

Express your answer to three significant figures
a) A solution of rubbing alcohol is 69.9  (v/v) isopropanol in water. How many milliliters of isopropanol are in a 76.6  sample of the rubbing alcohol solution?b) How many liters of a 3.27 solution... more
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11/16/20

chemistry homework
find the amount needed to raise the temperature of 5.00g of a substance from 20.0 celsius to 30.0 celsius if the specific heat of the substance is 2.01 j/g celsius
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11/16/20

Thermochemistry/Chemistry
Enthalpy of reaction for the combustion:    C(s) + O2(g) ⟶ CO2(g)                           ΔH1 = -395.5 kJ        CO(g) + O2(g) ⟶ CO2(g)                     ΔH2 = -285.0 kJ Using these date,... more
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11/16/20

A question on chemistry
Hydrogen peroxide can decompose to water and oxygen       2 H2O2(l)  2 H2O(l) + O2(g)                               H = -196 kJ What will the the amount of heat be released when 15.5 g of H2O2(l)... more
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11/16/20

Moles and PTVN problems
I am confused....If I have 500mL for my initial volume and 350mL for my final volume, this means that the effect is decreasing, I also have 0.0166 moles for my initial number of molecules. It is... more
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11/16/20

Arrange the compounds from highest lattice energy to lowest
Arrange the compounds according to the magnitudes of their lattice energies based on the relative ion charges and sizes from highest lattice energy to lowest lattice energy.NaF, MgO, KCl, MgF2
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11/16/20

Determine lattice energy
Consider an ionic compound, Mx2 , composed of generic metal M  and generic, gaseous halogen X.The enthalpy of formation MX2 is delta H°f= -991 kj/molThe enthalpy of sublimation of M delta H sub=... more
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11/16/20

Predict where the largest jump...
Hi, the question i need help on says this:Predict where the largest jump between successive ionization energies occur for Rb
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11/16/20

How to determine ionic or covalent bond when writing Lewis Structure formula
A bonding between a metal and a nonmetal is an ionic bond.However, another rule says if the EN value difference between the two elements is equal or great than 1.7, then that's ionic.Which rule we... more
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11/15/20

neutralization reaction
Maalox and Mylanta are both antacids that contain aluminum hydroxide as their active ingredient. Write the balanced equation for the neutralization of hydrochloric acid with aluminum hydroxide, ... more
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11/15/20

neutralization reaction
Write the balanced equation for the neutralization reaction between H2SO4 and KOH in aqueous solution. Phases are optional.neutralization reaction:
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