04/08/20

Chemistry question
How many isomers exist that have the molecular formula C4H10? three one four none two
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04/08/20

How many liters of ammonia gas (NH3) can be formed from the reaction of 150. L of H2?

Assume that there is complete reaction of hydrogen with excess nitrogen gas and that all measurements are made at the same temperature and pressure. First balance equation.
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04/08/20

How many liters of H2 gas at STP can be produced by the reaction of 4.60 g of Na and excess water, according to the following equation? Mole ratio first. 2Na(s) + 2H2O(l) → H2(g) + 2NaOH(aq)

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04/08/20

How many liters of ammonia gas (NH3) can be formed from the reaction of 150. L of H2?

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04/08/20

A calorimeter has a heat capacity of 1265 J/oC. A reaction causes the temperature of the calorimeter to change from 22.34oC to 25.12oC. How many joules of heat were released in this process?
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04/08/20

Chemistry Question
If 81.5 mol of an ideal gas occupies 45.5 L at 45.00 ∘C, what is the pressure of the gas?P = ____atm
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04/08/20

Chemistry Question

A gaseous mixture contains 448.0 Torr H2(g), 381.1 Torr N2(g), and 90.7 Torr Ar(g). Calculate the mole fraction, χ, of each of these gases.χH2=χN2=χAr=
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04/08/20

Which of the following has a positive enthalpy without a temperature change?
condensing has cooling a liquid evaporating a liquid cooling a solid
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04/08/20

Write and balance the equation for the complete combustion of heptane, C7H16. Phase symbols and energy changes are optional.
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04/08/20

Which of the following are True or False?
Label each statement as true or false: true false  The I−I bond is an ionic bond. true false  The C−Cu bond is a nonpolar covalent bond. true false  Although cesium is one of the least... more
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04/08/20

Consider the following molecules: PCl3 CO2 BrCl3 NCl3 How many lone pairs does each of the molecules have around the central atom?
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04/08/20

What is the molar mass of the unknown gas?
Tetrafluoroethylene (C2F4) effuses at a rate of 4.6×10-6 moles per hour. An unknown gas effuses at a rate of 6.5×10-6 moles per hour under identical conditions.
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04/08/20

What is the ratio of diffusion rates for argon and radon?
Which gas diffuses more rapidly?
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04/08/20

Atomic Emissions 3
Your microwave oven emits radiation at 2.45 MHz (which can interfere with your WiFi). What is its wavelength?
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04/08/20

Atomic Emission 2
What is the total E associated with one mole of photons (a unit known as the Einstein) of 3.91x1019 Hz?
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04/08/20

Atomic Emissions

What is the E associated with a single 748nm photon?
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04/08/20

Chemistry Ka1 and Ka2 question
What is the pH of a 0.15-M solution of H2SO3?Ka1=0.017, Ka2=6.4×10−8Completely lost on this question. Don't understand how to solve it.
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04/08/20

Chemistry question-Need to clear confusion??

Which of the following weak acid/conjugate base salt pairs would be the best choice for preparing a buffer with a pH of 5.25?a)HCN/NaCn Ka=6.2e-10b)KHSO3/K2SO3 Ka=6.0e-8c)CH3CH2CO2H/NaCH3CH2CO... more
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04/08/20

Chem question--solubility

The solubility of Ag2CO3 in water is 0.035g in 1.0 L of water at 25 °C. What is the value of Ksp for Ag2CO3?
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04/08/20

4. Calculate the amount of sugar in 500 mL of a 10% (mass/volume) sugar solution. {grams of solute/mL of solution}

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04/08/20

chem question! Volume and equivalence point
28.6 mL of 0.207 M KOH is titrated with 0.143 M of HNO_3. What volume of HNO_3 (in mL) is needed to reach the equivalence point?
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04/08/20

Chemistry question

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq), as described by the chemical equationMnO2(s)+4HCl(aq)⟶MnCl2(aq)+2H2O(l)+Cl2(g)How... more
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04/08/20

Chemistry Question
Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0 °C and 1.0 atm. Assume ideal behavior, and use two significant... more
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04/08/20

Chemistry question
A 1.75 g sample of an unknown gas at 47 ∘C and 1.05 atm is stored in a 2.15 L flask.What is the density of the gas? (g/L)What is the molar mass of the gas? (g/mol)
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04/07/20

The formation of 23.0 g of O2 results in
Consider the reaction.2Fe2O3⟶4Fe+3O 2ΔH∘rxn=+824.2 kJThe formation of 23.0 g of O2 results in
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