04/23/20

What is the energy change when the temperature of 14.0 grams of gaseous helium is decreased from 38.0 C to 21.8 C?
Answer should be in joules
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04/23/20

What is the pressure of this gas sample in mm Hg?
1.12 mol sample of carbon dioxide gas at a temperature of 10.0 C is found to occupy a volume of 25.5 liters.
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04/23/20

Compute the root-mean-square speed of At molecules in a sample of argon gas at a temperature of 72 C
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04/23/20

a 5.40 g sample of sodiem hydrogen carbonate reacts with excess acetic acid to form sodium acetate by the reaction below. when the reaction is comple 4.80 g of sodium acetate recovered

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04/23/20

Gas Law Chemistry
What is the volume of 0.0800 g of C2H2F4 vapor at 0.971 atm and 38.7◦C?
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04/23/20

Chemistry Gas Law
1) What is the mass of 4 L of water vapor at 120◦C and 396 torr?
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04/23/20

calculate for ΔG
For a particular reaction at  219.6°C, Δ𝐺=−139.48 kJ/mol  and Δ𝑆=594.04 J/(mol⋅K)Calculate ΔG for this reaction at  -11.4°C.
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04/22/20

The daily output of stomach acid (gastric juice) is 1000 to 2000 mL. Prior to a meal, stomach acid (HCl) typically has a pH of 1.39.

A) What is the [H3O+] of stomach acid? B)One chewable tablet of the antacid Maalox contains 600. mg of CaCO3. Enter the neutralization equation. C)Given that one chewable tablet of the antacid... more
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04/22/20

What volume of gas (in mL) at STP would have 32.5 mL at 745.2 mm Hg and 23.5 degrees Celsius?
What volume of gas (in mL) at STP would have 32.5 mL at 745.2 mm Hg and 23.5 degrees Celsius?
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04/22/20

In the reaction between Al and HCl, if 1.32 g Al were reacted with excess hydrochloric acid, how many mL of Hydrogen gas could theoretically be emitted at STP?
In the reaction between Al and HCl, if 1.32 g Al were reacted with excess hydrochloric acid, how many mL of Hydrogen gas could theoretically be emitted at STP?the balanced equation should be:2 Al +... more
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04/22/20

General Chemistry Acids and Base Question

What is the hydroxide ion concentration of a KOH solution that has a pH of 9.20?
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04/22/20

Chemistry homeowrk help
Calculate the specific heat of copper. The specific heat of water is 4.18 J/(g·°C)the mass of water and the mass of copper.M water=60M copper= 17.920The temperature change of the water and... more
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04/22/20

Redox reaction oxidation state
Hi, I have written the oxidation states for the following reaction, would be grateful if anyone would see if I have done it correctly?Oxidation state: 0 +I +II ... more
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04/22/20

Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.21% abundance), X-29 (28.976 amu, 4.70% abundance), and X-30 (29.974 amu, 3.09% abundance).
Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.21% abundance), X-29 (28.976 amu, 4.70% abundance), and X-30 (29.974 amu, 3.09% abundance). Calculate the atomic... more
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04/22/20

A sample of ammonia, NH3, has a mass of 56.6 grams. Calculate the number of hydrogen atoms present in this sample.

A sample of ammonia, NH3, has a mass of 56.6 grams. Calculate the number of hydrogen atoms present in this sample. Answers"6.67 x 10235.44 x 10236.00 x 10242.00 x 1024
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04/21/20

What volume of a 0.170 M NH4I solution is required to react with 853 mL of a 0.440 M Pb(NO3)2 solution?
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04/21/20

freezing point chem

What is the freezing point of a water solution with the total volume of 1.00L, that is made by dissolving 95.7 grams of manganese(II) sulfate, MnSO4 in water? Assume that MnSO4 dissociates... more
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04/21/20

What percent of a cesium-131 sample remains after 60 days?
Cesium-131 has a half-life of 9.7 days. What percent of a cesium-131 sample remains after 60 days?I got 1.8 but the answer is 1.4.I just want to see my error
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04/21/20

What Volume of a 0.53 M HCl solution is required to neutralize 16.5 mL of a .124 M Ca(OH)2 Solution?
What Volume of a 0.53 M HCl solution is required to neutralize 16.5 mL of a .124 M Ca(OH)2 Solution?
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04/21/20

A mixture of gases at s.t.p contains 65% of N2, 15% of CO2 and 20% of O2 by volume. What is the partial pressure of each gas in mmHg?
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04/21/20

What is the density of NH3 at 67°c and 800 torr
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04/21/20

What is the apparent molecular weight of air assuming it contains 78% of N2, 21% of O2 and 1% argon by volume
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04/21/20

The enthalpy of combustion of ethane gas, C2H6(g), is about -1.5*103 kJ/mol.

When ethane reacts with O2(g), the products are carbon dioxide CO2(g) and water H2O(l). How much heat is released during the combustion of ethane gas when 14 mols of O2(g) are consumed. Express... more
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04/21/20

How much heat is released during the formation of 3.18 mol HCl(g) in this reaction: H2(g)+Cl2(g) → 2HCl(g) with a ∆H of -184.6 kJ. Express your answer in kJ.
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04/21/20

chemistry pre lab

While you were cleaning the lab, you found a bottle with 150.0 mL of liquid labeled "1.50 M Sulfuric Acid." Since sulfuric acid is no longer used in your lab, your advisor asks you to prepare it... more
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