11/02/20

How do I go about solving the questions to A, B, C, D? I do not even understand where to begin.
A. A certain medicine used to cure an upset stomach contains NaHCO3. One of my students decided to analyze this medicine, using methods she learned in 1211/1212. She found that the mass of one... more
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11/02/20

Which set of quantum numbers could correctly describe a subshell containing valence electrons in a Se atom?
Which set of quantum numbers could correctly describe a subshell containing valence electrons in a Se atom?I. n=4, l=0II. n=4, l=1III. n=3, l=2
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11/02/20

What is the wavelength of the second photon emitted?
A ground state H atom absorbs a photon of energy 2.093 x 10^-18 J, and its electron attains a higher energy level. As the atom relaxes, it emits two photons: one of wavelength 1282 nm to reach an... more
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11/02/20

enthalphy formation from enthlapy reactions
A scientist measures the standard enthalpy change for the following reaction to be -605.2 kJ :2CO(g) + O2(g)2CO2(g)Based on this value and the standard enthalpies of formation for the other... more
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11/02/20

using standard heats of formation
Using the standard heats of formation that follow, calculate the standard enthalpy change for the following reaction.CH4(g) + 2O2(g)CO2(g) + 2H2O(g)     H°rxn = fill in the blank... more
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11/02/20

Standard Heat of formation
A. Write the balanced chemical equation that represents the standard heat of formation of KCl(s) at 298 K.Use the pull-down boxes to specify states. Write fractions with a slash, such as 1/2 for... more
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11/02/20

Enthalphy of Reactions Hess's Law

Given the standard enthalpy changes for the following two reactions:(1) 2Fe(s) + O2(g)2FeO(s)...... ΔH° = -544.0 kJ(2) 2Hg(l) + O2(g)2HgO(s)......ΔH° = -181.6 kJwhat is the standard enthalpy change... more
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11/02/20

Enthalpy of Reactions Hess's Law
A. Given the standard enthalpy changes for the following two reactions:(1) 4C(s) + 5H2(g)C4H10(g)...... ΔH° = -125.6 kJ(2) C2H2(g)2C(s) + H2(g)......ΔH° = -226.7 kJwhat is the standard enthalpy... more
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11/02/20

Chemistry question
When a .......... gas is passed in a solution of .......... no obvious change in the color of the solution occurs.a- CO2 / Ca(OH)2b- NH3 / NaOHc- H2S / (CH3COO)2Pbd- SO2 / acidified K2Cr2O7## I... more
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11/02/20

Protolysis of sulfuric acid
Hi!I have the following question: 0.05 moles of sulfuric acid was mixed with water to the volume of 1 cubic decimetres. What is the pH-value of the solution?My answer: First I wrote the reaction:... more
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11/02/20

What is the solubility of Cd₃(PO₄)₂ in water? (Ksp of Cd₃(PO₄)₂ is 2.5 × 10⁻³³)
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11/02/20

What is the solubility of PbF₂ in water? (Ksp of PbF₂ is 3.6 × 10⁻⁸)
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11/02/20

What is the solubility of La(IO₃)₃ in a solution that contains 0.200 M La³⁺ ions? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²)
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11/02/20

What is the maximum concentration of Ag⁺ that can be added to a 0.00200 M solution of Na₂CO₃ before a precipitate will form? (Ksp for Ag₂CO₃ is 8.10 × 10⁻¹²)
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11/02/20

In a titration of 0.608 L of 1.222 M B solution, how many liters of 1.088 M A solution are required to reach the end-point.
A + 2B → 2C + D
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11/02/20

hen heated, KClO3 decomposes into KCl and O2. 2KClO3⟶2KCl+3O2 If this reaction produced 34.8 g KCl, how many grams of O2 were produced?
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11/02/20

If 4.04 mol of C5H12 reacts with excess O2, how many moles of CO2 will be produced by the following combustion reaction?
If  mol of  reacts with excess  how many moles of  will be produced by the following combustion reaction?C5H12+8O2⟶6H2O+5CO2
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11/02/20

If you burn 31.4 g of hydrogen and produce 281 g of water, how much oxygen reacted?
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor.If you burn  g of hydrogen and produce  g of water, how much oxygen reacted?
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11/02/20

A chemist requires 0.787 mol Na2CO3 for a reaction. How many grams does this correspond to? mass: g Na2CO3
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11/01/20

Solid ammonium chloride, NH4Cl, is formed by the reaction of gaseous ammonia, NH3, and hydrogen chloride, HCl.

NH3(g)+HCl(g)⟶NH4Cl(s) A 6.44 g sample of NH3 gas and a 6.44 g sample of HCl gas are mixed in a 0.50 L flask at 25 ∘C.Identify the limiting reagent.How many grams of NH4Cl will be formed by... more
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11/01/20

In a titration of 0.368 L of 1.222 M B solution, how many liters of 1.088 M A solution are required to reach the end-point. A + 2B → 2C + D
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10/31/20

How do you find moles of ions in these chemistry problems?
How many moles of ions are in the following?(a) 0.0132 g AgNO3  mol (b) 0.175 mol K2CrO4  mol (c) 0.481 g Ba(OH)2  mol (d) 1.37  10-9 mol Na2CO3  mol
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10/31/20

If you are driving this same 235.6 miles at a constant speed of 65 mph, how long will it take until you arrive?
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10/31/20

The average kinetic energy of the molecules in a gas sample depends only on the temperature, 𝑇.

However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms = square root 3RT/ℳwhere 𝑅=8.314 J/(mol⋅K) and ℳ is molar... more
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10/31/20

For the given reaction, what volume of O2 would be required to react with 4.8 L of NO , measured at the same temperature and pressure? 2NO(g)+O2(g)⟶2NO2(g)
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