09/15/19

I have 4 of the same type of question with different numbers. When X is increasing/decreasing, how fast is Y increasing/decreasing?
Consider the reaction. 2D(g) + 3E(g) + F(g) => 2G(g) + H(g). When G is increasing at 0.39 mol/Ls, how quickly is D decreasing? the answer is 0.39. 2/2(0.39) = 0.39. Consider the reaction, 2D(g)... more
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09/15/19

What is the mole ratio of chromium to nickel atoms in this steel?
The gleaming metallic appearance of the Gateway Arch in St. Louis, Missouri, comes from the stainless steel used in its construction. This steel is made mostly of iron, but it also contains 19% (by... more
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09/15/19

Attempt 3, Question 8. Given the data below, find k.
Experiment Initial conc of A, mol/L Initial conc of B, mol/L Initial conc of C, mol/L Initial rate, mol/L.s 1 0.1 0.2 0.4 2 x 10-3 2 0.2 0.2 0.4 4 x 10-3 3 0.3 0.4 0.4 6 x... more
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09/14/19

when the solid iron bar in the diagram is heated, it no longer fits the holder
Use particle theory to explain why this happens
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09/14/19

Chromel is an alloy of 90.% nickel and 10.% chromium by mass. Ho much chromel can be made from 5.0 mL of chromium (d=7.19g/mL)?
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09/14/19

Chem: when mass changes
Explain what it means for mass to change.
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09/14/19

Question 11. Given the data below, find k.
Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F, the reaction is [a] order in A, [b] order in B, [c] order in C and [d] order overall. Experiment Initial conc of A,... more
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09/14/19

Given the data below, find k.

Given the data below for the reaction, 2A + 2B + 4C => D + E + 3F Experiment Initial conc of A, mol/L Initial conc of B, mol/L Initial conc of C, mol/L Initial rate, mol/L.s 1 0.1 0.2 0.4 2... more
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09/13/19

constant pressure calorimeter
In a constant‑pressure calorimeter,  70 mL of 0.350 M Ba(OH)2 was added to 70 mL of 0.7 M HCl.The reaction caused the temperature of the solution to rise from  21.35 degrees C to 26.12 degrees... more
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09/13/19

General Chemistry Homework Question
The standard (1 bar) boiling point of acetone is 56.1 C, and its enthalpy of vaporization is 29.1 kJ/mol. Calculate the vapor pressure of acetone at 43.5 C.
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09/13/19

General Chemistry Homework Question
Suppose that 132.0 J of heat energy is required to completely vaporize 3.1 g of a pure liquid. If the molar mass of the liquid is 40.17 g/mol, what is the molar enthalpy of vaporization of the liquid? more
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09/13/19

General Chemistry Homework Question
The vapor pressure and enthalpy of vaporization of an unknown substance are measured to be 222.6 torr and 36.4 kJ/mol, respectively at room temperature (298.15 K). Estimate the normal boiling point... more
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09/13/19

calculate the amount of CO2 ( in grams ) that could be produced from 76 g of C3H8?
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09/13/19

Calculate the amount of CO2 (in grams) that could be produced from 76 g of C3H8?
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09/13/19

Calculate the amount of CO2 (in moles) that could be obtained from 5 moles of propane gas that burns in excess oxygen
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09/12/19

percents abundance and isotopes
Copper has two naturally occurring isotopes and an atomic mass of 63.546 amu. Cu-63 has a mass of 62.940 amu and an abundance of 69.17%. What is the identity and percent abundance of copper's other... more
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09/12/19

Calculate the heat change in kilojoules for melting 4.00 kg of ice at 0 ∘C.
Express your answer as a positive value using three significant figures and include the appropriate units.
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09/12/19

Calculate the heat change in kilocalories for melting 120 g of ice at 0 ∘C.
Express your answer as a positive value using two significant figures and include the appropriate units.
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09/12/19

Calculate the heat change in joules for freezing 235 g of water at 0 ∘C.
Express your answer as a positive value using three significant figures and include the appropriate units.
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09/12/19

Calculate the heat change in calories for freezing 65 g of water at 0 ∘C.
Express your answer as a positive value using two significant figures and include the appropriate units.
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09/12/19

A hot-water bottle contains 799 g of water at 53∘C. If the liquid water cools to body temperature (37 ∘C), how many kilojoules of heat could be transferred to sore muscles?
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09/12/19

The energy needed to keep a 75-watt lightbulb burning for 1.0 h is 270 kJ. Calculate the energy required to keep the lightbulb burning for 4.0 h in joules.
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09/12/19

Chemistry heat equation

Show how to determine (and then calculate) the final temperature (in °C) of a 215 g copper pan when 6175 calories of energy are added to the copper pan that is initially at 20.3 °C. (the specific... more
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09/12/19

Non-polar molecules are hydrophilic.

Is this statement true or false?
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09/11/19

Chemistry help with equilibrium

2A(g) <-> B(g) kp= 3.51x10^-5if a sample of A(g) at 2.10 atm is heated to 500 K, what is the pressure of B(g) at equilibrium? Please help I can’t geg the right answer.
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