10/21/21

Are the following Chemistry problems correct?
For the equation CaCO3 (s) + 2HCl (aq) → CaCl2 (s) + H2 (aq) + H2O (l), 100.00 g of CaCO3 pellets are combined with 250 mL of HCl of a 2.0 M solution. Which of the following will increase the rate... more
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10/21/21

Are my answers to these questions on chemical equations correct?
A series of chemical equations used to indicate the step-by-step processes by which a chemical reaction occurs is called a(n) _______.A. equation seriesB. reaction mechanismC. catalyst seriesD. All... more
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10/21/21

Which of the following statements is true?
A. Increasing temperature increases the reaction rate.B. Increasing the concentration of a reactant usually increases the reaction rate.C. Decreasing the concentration of a reactant usually... more
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10/21/21

1. Potassium has three stable isotopes, potassium-39, potassium-40 and potassium- 41. Calculate the average atomic mass of the element based on the percent abundance of its isotopes
1.     Potassium has three stable isotopes, potassium-39, potassium-40 and potassium- 41. Calculate the average atomic mass of the element based on the percent abundance of its isotopes
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10/21/21

Calculate the number of molecules of oxygen in a 5.45×105 g sample of oxygen.
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10/21/21

Chemistry Homework
A reaction vessel contains 8.900 g of CO and 8.900 g of O2. How many grams of CO2 could be produced according to the following reaction?
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10/21/21

How many moles of CaSO4 are in 8.37×1024 formula units?
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10/21/21

Chemistry Homework
The combustion of 135 mg of a hydrocarbon produces 440 mg of CO2 and 135 mg H2O. The molar mass of the hydrocarbon is 270 g/mol. Determine the molecular formula of this compound.
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10/21/21

Chemistry Homework
Carbon monoxide reacts with oxygen gas to form CO2, as shown by the balanced equation below.A reaction vessel contains 2.700 g of CO and 2.700 g of O2.How many moles of CO and O2 do these masses... more
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10/21/21

For the compound AuCl3, the percent gold (Au) by mass is  %? If you have a sample of 24.85 g AuCl3, the mass of gold in that sample is  g?
For the compound AuCl3, the percent gold (Au) by mass is  %?If you have a sample of 24.85 g AuCl3, the mass of gold in that sample is  g?
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10/21/21

How much 2.00 M H3PO4, in mL, would you need to add to 50.00 mL of 3.50 M Ca(OH)2 in order to neutralize the solution?
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10/21/21

I need help balancing this reaction in a basic solution.
I- + MnO4^2- → MnO2 + I2 
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10/21/21

: Differentiate between effusion and diffusion of gases in regard to the ammonium chloride formation experiment.

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10/21/21

STOICHIOMETRY CHEMISTRY
A certain type of gas is found inside a polyethylene container with a pressure equivalent to 721.0 torr. If thevalue of moles of the said gas is 12.01 moles, what would be the amount of pressure... more
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10/21/21

please and thank you

A 2.50 g sample of powdered zinc is added to 100.0 mL of a 2.00 M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The... more
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10/21/21

chemistry lesson

A system does 536 kJ of work and loses 246 kJ of heat to the surroundings.What is the change in internal energy, Δ𝐸, of the system? Note that internal energy is symbolized as Δ𝑈 in some sources.
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10/21/21

Chem I Help Please?
Solid potassium chlorate (KClO3) decomposes into potassium chloride and oxygen gas when heated. How many moles of oxygen form when 46.1 g completely decomposes?What mass of carbon dioxide is... more
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10/21/21

Chemistry Homework
When 0.132 moles of HCl reacts with 0.440 moles of NH3, how much NH3 is consumed?
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10/21/21

Percent composition of compounds
Ammonium sulfate, (NH4)2SO4, is a commonly used fertilizer. Instructions for fertilizing a mature avocado three call for 1 lb. (pound) of actual nitrogen per year. How many pounds of ammonium... more
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10/20/21

Consider the reaction B2H6(g) + 3 O2(g) → B2O3(s) + 3 H2O(g) ∆H = -2035 kJ How much heat is released when a mixture of 8.64 g B2H6 and 7.18 g O2 is burned?
Consider the reactionB2H6(g) + 3 O2(g) → B2O3(s) + 3 H2O(g) ∆H = -2035 kJHow much heat is released when a mixture of 8.64 g B2H6 and 7.18 g O2 is burned?
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10/20/21

Chemistry Question PLEASEEE help
A student decides to find the molar enthalpy for the reaction between phosphoric acid and calcium hydroxide. They have a 0.250 M solution of Ca(OH)2, which they will use; they can only find a 2.1 M... more
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10/20/21

Chem 12 ice table

At 50 degrees C the reaction: HBr (g) +FCl (g) <-> HF (g) +BrCl (g) has Keq = 17.8. 2 mol of each reactant is added 1 L flask. Determine concentrations for each gas at equilibrium.
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10/19/21

The rate of a standard reaction is 0.01840 M/s at 25 oC. It is determined that this is too fast, and that the rate should be reduced to 0.0046 M/s.

What temperature should the reaction be run at to achieve this?A. 45 °CB. 20 °CC. 15 °CD. 5 °CE. 0 °CI got D. 5 °C. Would this be correct?
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10/19/21

Would my answers to the following chemistry problems be correct?
For the following problems I had to use the general rate equation: R = k[A]x[B]y.Which term is the symbol for the rate constant?A. [A]B. kC. RD. x + yE. None of the AboveWhich term represents... more
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10/19/21

Chemistry Lab Homework
If a 0.192 g sample of copper metal reacts with elemental sulfur to form 0.240 g of the sulfide product, (a) find the percent by mass of copper and sulfur in the product and (b) find the empirical... more
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