25,963 Answered Questions for the topic chemistry

Chemistry

03/12/24

4 ClO3- + 2 SbO+ + 2 H+ 4 ClO2 + Sb2O5 + H2O
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Chemistry

03/12/24

2 SO32- + 4 Br- + 3 H2O 2 Br2 + S2O32- + 6 OH- In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.
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Chemistry

03/12/24

Finding Molar mass using the ideal gas law
Mass of Unknown Metal    0.0527g Volume of H2 Gas Produced  25.5 mL Barometric Pressure   755 mm Hg Temperature of Water  298 K What is the molar mass of the metal used in this... more
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Chemistry

03/11/24

Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 1.43 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) What is the pH of the buffer after 0.250 mol of OH⁻ have been added?
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Chemistry

03/11/24

Finding Molar Mass using Ideal Gas Law
Mass of Unknown Metal    0.0527g Volume of H2 Gas Produced  25.5 mL Barometric Pressure   755 mm Hg Temperature of Water  298 K What is the molar mass of the metal used in this... more
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03/10/24

Calculate the molarity of the hypochlorite ion OCL- provided.
The mass of NaOCL added is 0.651 gramsthe density given is 1.08g/mltemperture 22C6% W/V (weight/volume)only 1mL of NaOCL as added to 5mL of EB solution (erythrosin B)
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Chemistry

03/10/24

Chemistry 111: Enthalpy change

1.      Consider the following reaction:2 CH4(g) + O2(g)   à   2CH3OH(g) DH=-252.8 kJ Is this reaction exothermic or endothermic? Calculate the amount of heat transferred when 35.0 g of CH4(g) is... more
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Chemistry

03/10/24

how do I find ion concentration at equilibrium from the dissociation/formation of a complex ion?

I have the formation constant and the molarity of the simple metal ion and the polyatomic ion that forms the complex ion. How do I find the ion concentration of the simple metal ion?
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Chemistry

03/09/24

2. Use Hess’s law and the following reactions to calculate the enthalpy change for AC A  B H=+34 kJ C  B H=+82 kJ
1.      Use Hess’s law and the following reactions to calculate the enthalpy change for    AàCA à B  DH=+34 kJC à B   DH=+82 kJ
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Chemistry Organic Chemistry

03/09/24

If an atom has 7 protons, 8 neutrons and 4 electrons, what is the atom’s atomic symbol?
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Chemistry

03/09/24

If 20.0g Mg react with excess HCl to form magnesium chloride and hydrogen gas, how much MgCl 2 is produced? __Mg + __HCl → __MgCl2 + __H2
Stoichiometry, chemistry, measurement
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Chemistry

03/08/24

The Ka of a monoprotic weak acid is 0.00361. what is the precent ionization of a 0.155 M solution of this acid

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Chemistry

03/08/24

what is pH of 8.8 x 10^-8 M HCl
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Chemistry

03/08/24

Using the ideal equation of state
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures 12.0cm wide and 14.4cm high.... more
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Chemistry

03/08/24

Using relative effusion rates to find an unknown molar mass
A gas made up of homonuclear diatomic molecules escapes through a pinhole 0.325 times as fast as He gas. Write the chemical formula of the gas.
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Chemistry

03/08/24

Using relative effusion rates to find an unknown molar mass
A gas made up of atoms escapes through a pinhole 0.839 times as fast as N2 gas. Write the chemical formula of the gas.
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Chemistry

03/08/24

Calculating Total Pressure
A 10.0L tank at 25.8°C is filled with 13.8g of dinitrogen monoxide gas and 10.6g of sulfur hexafluoride gas. You can assume both gases behave as ideal gases under these conditions.Calculate the... more
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Chemistry

03/08/24

In a titration of 34.0 mL of a 0.425 M solution of a diprotic acid H₂C₄H₄O₆ (tartaric acid) with 0.155 M LiOH, how many mL of base are required to reach the first equivalence point?
please be accurate in rounding
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Chemistry

03/08/24

how many total atoms are in 0.450 grams of p2o5
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Chemistry

03/08/24

calculating the pH
Find the pH and [OH-] of a 3.5 x 10-6 solution of H3PO4.
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Chemistry

03/07/24

Acid-base titration
An aqueous solution of Ba(OH)2 has a [H3O+] of 1 x 10-11 M. What is [OH-]? What is the concentration of the solution? An aqueous solution of iron (III) hydroxide has a pH of 11.59. What is the... more
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Chemistry

03/07/24

Gas Law Lab/ Molarity

11. How many moles of COz can be produced from the three different amounts of vinegar in this reaction?the 3 different amounts are 5 milliliters 10 milliliters 20 milliliters
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Chemistry

03/07/24

what is the equilibrium partial pressure of HF?

An empty steel container is filled with 6.60 atm of H₂ and 6.60 atm of F₂. The system is allowed to reach equilibrium. If Kp = 0.450 for the reaction below, what is the equilibrium partial pressure... more
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Chemistry

03/07/24

Chemistry stoicheometry
how many grams of MgCl2 can be made from the 164 grams of HCl
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Chemistry

03/07/24

Equilibrium Constant Kp
A 79.2 g chunk of dry ice (solid CO2) and 30.0 g of graphite (carbon) were placed in an empty 5.00 L container, and the mixture was heated to achieve equilibrium. The reaction isCO2(g)+C(s)⇌2CO(g).... more
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