25,990 Answered Questions for the topic chemistry

Chemistry

04/17/23

Chemistry HW question

NOTE: You may never use the dilution equation in place of stoichiometry for a reaction.1) A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solution. What is the EDTA... more
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Chemistry

04/17/23

please help me ...
You heat 3.854 g of a mixture of Fe3O4 and FeO to form 4.148 g Fe2O3. The mass percent of FeO originally in the mixture was: A) 92.9% B) 55.8% C) 44.2% D) 38.5% E) none of these
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Chemistry

04/17/23

Acids and Bases - Buffers
Buffer Systems Operate In A Roughly 2.0 PH Unit Range, Centered Around What Value? (Hint: Think Henderson-Hasselbalch Equation.)
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Chemistry

04/17/23

Chemistry help!
You would like to produce a gold-plated coin by plating gold onto a penny 1.90 cm in diameter. How many days will it take to produce a layer of gold 0.250 mm thick (on both sides of the coin) from... more
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Chemistry

04/17/23

Using the mass percentage of oxygen in KClO3 (43.4%), calculate the maximum amount of oxygen in grams you could produce with 1.503g of KClO3 that you heat.

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Chemistry

04/17/23

Stuck on chemistry problem

What is the pH and pOH of a solution that was made by adding 245 mL of water to 500 mL of 4 * 10 ^ - 4 M HF solution?PH?round to 1 decimal placepOH 1 decimal place
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Chemistry

04/17/23

Stuck on problem due tonight

What is the pH and pOH of a solution made by adding water to 23.2 grams of calcium hydroxide until the volume of the solution is 2500 ? (Hint: solve for molarity first !pOH?round to 1 decimal place... more
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Chemistry

04/17/23

Chemistry Question
A small weather balloon launched at sea level starts out at a volume of 1,000 liters at 25 degrees C and 1.00 atm of pressure. What is its volume when it reaches an altitude of 40,000 feet where... more
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Chemistry

04/17/23

Question in desciption
A typical high-pressure cylinder of helium contains 200 grams of the gas. If all the gas is used to inflate 5-liter part balloons, how many balloons could you fill? Assume the balloons are at STP.... more
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Chemistry

04/17/23

Stuck on chem problem due tonight

What is the hydroxide ion concentration of a solution that has a pOH of 4.5? Hydrogen ion concentration round to 3 sig figs
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Chemistry

04/17/23

If the dissolution of borax in water is non-spontaneous at room temperature, why does a very small amount still dissolve?
I can't wrap my head around why the dissolution of borax still occurs (although very little) even though it's non-spontaneous at room temperature.
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Chemistry

04/17/23

Question In Description
An engineer used the reaction below to generate SiF4 gas. How Many liters of SiF4 gas could she generate by reacting 75 grams of HF with an excess of SIO2, if the pressure of the SiF4 is 745 torr... more
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Chemistry

04/17/23

Question In Description
A scientist used the reaction below to generate KCLO3. How many grams of KCLO3 could be prepared from 8.75 L of Cl2 gas, if the gas was originally at a pressure of 1275 mmHg at a temperature of... more
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Chemistry

04/17/23

weak base ionization help
A buffered solution containing dissolved aniline, C6H5NH2, and aniline hydrochloride, C6H5NH3Cl, has a pH of 5.66A. Determine the concentration of C6H5NH3+ in the solution if the concentration... more
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Chemistry

04/17/23

Calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH = 10.26.
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Chemistry

04/17/23

What mass of ammonium chloride should be added to 2.65 L of a 0.165 M NH3 in order to obtain a buffer with a pH of 9.65?
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Chemistry

04/17/23

Consider the following equation in aqueous solution: PO₃³⁻(aq) + SO₂(g) → PO₄³⁻(aq) + S²⁻(aq) Write the balanced half-reaction for the oxidation in acidic solution.
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Chemistry

04/16/23

A 21.0-liter gas cylinder contains 7.6 moles of nitrogen gas and 3.4 moles of oxygen gas. If the temperature of inside the cylinder is 0 °C, what is the total pressure inside the cylinder?
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Chemistry

04/16/23

Consider the reaction at 298 K. C(graphite)+2H2(g)⟶CH4(g)Δ𝐻°=−74.6 kJ/mol Calculate the quantities for ΔSsys, ΔSsurr, ΔSuniv.
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Chemistry

04/16/23

Consider the following reaction at 298 K. 4Al(s)+3O2(g)⟶2Al2O3(s)Δ𝐻∘=−3351.4 kJ
Δ𝑆sys=Δ𝑆surr=Δ𝑆univ=
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Chemistry

04/16/23

Calculate the standard entropy change for the reaction at 25 °C. Standard molar entropy values can be found in this table. C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(g)
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Chemistry

04/16/23

Calculate the standard entropy change for the reaction at 25 °C. Standard molar entropy values can be found in this table. 2CH3OH(g)+3O2(g)⟶2CO2(g)+4H2O(g)
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Chemistry

04/16/23

If 20.5 g of BaSO4(s) are precipitated from the reaction, what was the molar concentration of Ba2+ in the original sample?
Excess Na2SO4(aq) is added to a 3.07×102 mL sample of industrial waste containing Ba2+ ions. If 20.5 g of BaSO4(s) are precipitated from the reaction, what was the molar concentration of Ba2+ in... more
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Chemistry

04/15/23

Net ionic equation of 2 HNO3, (ag) + Sr(OH)2, (aq) - > 2 H2O(l) + Sr(NO3 )2 (ag)
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Chemistry

04/15/23

Chemistry HW question

If each of these ions were reduced to metal with one coulomb, which would yield the greatest mass?(A) Cu^2+ (aq)(B) Ag^+ (aq)(C) Hg^2+ (aq)(D) Cu^+ (aq)
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