25,963 Answered Questions for the topic chemistry

Chemistry

05/22/23

If a buffer solution is 0.540 M in a weak acid (đŸa=7.4×10−6) and 0.220 M in its conjugate base, what is the pH?
If a buffer solution is 0.540 M in a weak acid (đŸa=7.4×10−6) and 0.220 M in its conjugate base, what is the pH?
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Chemistry

05/21/23

How to calculate the absolute rate of diffusion for 2 gases under the same conditions
The absolute rate of diffusion of hydrochloric gas is found to be 1.40 × 10-4 m/s. What is the absolute rate of diffusion of ammonia gas (in m/s) under the same conditions?
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Chemistry

05/21/23

chem 1 please help
A chemist has a block of iron metal (density is 7.87 g/mL). The block weighs 2.70 g. What is the volume of the iron block in mL?
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Chemistry

05/21/23

Molar Enthalpy of Reaction for Mg(s)
Using 50.0 mL of 1.0 mol/L hydrochloric acid (HCl) and the specific heat of water is 4.19J/g°CCalculate the molar enthalpy of reaction for Mg(s) for each of the 3 trials.Trial 1: Mass of Mg(s)=... more
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Chemistry

05/20/23

Calculate the Molar Enthalpy of Reaction
Calculate the molar enthalpy of reaction for Mg(s) for each of the 3 trials.Trial 1: Mass of Mg(s)= 0.15g┃Change in Temp. 13.6°CTrial 2: Mass of Mg(s)= 0.25g┃Change in Temp. 22.7°CTrial 3: Mass of... more
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Chemistry

05/19/23

If a solution containing 19.35 g of lead(II) nitrate is allowed to react completely with a solution containing 6.256 g of sodium sulfate, how many grams of solid precipitate will be formed?

How many grams of the reactant in excess will remain after the reaction?Assuming complete precipitation, how many moles of each ion remain in the solution? If an ion is no longer in solution, you... more
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Chemistry

05/19/23

If 126.0 grams of methane gas are recovered in the lab, what is the percent yield of methane gas?

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Chemistry

05/19/23

What is the theoretical yield of methane gas, CH4, if 235.0 grams of carbon react with excess water? ____ C (s) + ____ H2O (g) → ____ CH4 (g) + ____ CO2 (g)
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Chemistry

05/19/23

What mass, in grams, of phosphorus trichloride will be produced from the 85.0 grams of phosphorus when it reacts with excess chlorine gas?

_____ P4 + ____ Cl2 → _____ PCl3
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Chemistry

05/18/23

A researcher is using 6.53 x 1023 molecules of chlorine gas (Cl2) in an experiment.
A researcher is using 6.53 x 1023 molecules of chlorine gas (Cl2) in an experiment. How many grams of chlorine is the researcher using? Remember to include units (abbreviated appropriately) and the... more
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Chemistry

05/18/23

A researcher is using 6.53 x 1023 molecules of chlorine gas (Cl2) in an experiment.
A researcher is using 6.53 x 1023 molecules of chlorine gas (Cl2) in an experiment. How many grams of chlorine is the researcher using? Remember to include units (abbreviated appropriately) and the... more
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Chemistry

05/18/23

Chemistry question

‱What is the common-ion effect and how does it related to Le Chatelier's Principle
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Chemistry

05/18/23

Le Chatelier's Principle
A system of R -> <- P is at equilibrium. You add more R to the system. (The reaction is reversible)R = reactant, P = productDoes adding R change the rate of the reverse reaction?
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Chemistry

05/17/23

Preparing a buffer solution from a weak acid/strong base mixture
You have at your disposal an ample quantity of a solution of 0.0500 M NaOH(aq) and 500 mL of a solution of 0.100 M formic acid (HCOOH(aq)). How much of the NaOH(aq) solution should be added to the... more
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Chemistry

05/17/23

If the starting temp is -50c the mass of copper is 25g and the infared view is 23.9c
Identify the expected cold temperature when it is removed from the cold water using this equation Q=mcđŸ”șT
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Chemistry

05/17/23

Which of the following best describes what happens when MgBr2 dissolves in water? 
Which of the following best describes what happens when MgBr2 dissolves in water?  The solute and solvent molecules form a crystalline structure.  The solute and solvent molecules do not... more
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Chemistry

05/17/23

A student is making a solution of sugar in water, what is the molarity of the student's sugar solution?
A student is making a solution of sugar in water. If the student uses 0.62 moles of sugar and enough water to make 530.54 milliliters of solution, what is the molarity of the student's sugar... more
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Chemistry

05/17/23

How many moles of Al(NO3)3 are produced when 15.87 grams of HNO3 are reacted with excess Al(OH)3? 
How many moles of Al(NO3)3 are produced when 15.87 grams of HNO3 are reacted with excess Al(OH)3? Round your answer to three digits after the decimal point.* Al(OH)3 + 3 HNO3 = Al(NO3)3 + 3 H2O
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Chemistry

05/17/23

What is the maximum mass of ammonia that can be formed when 43.00 grams ....
What is the maximum mass of ammonia that can be formed when 43.00 grams of nitrogen gas reacts with 10.62 grams of hydrogen gas according to the following equation? Please round your answer to the... more
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Chemistry

05/17/23

Chemistry question
45g of Hydrobromic acid is neutralized with 100g of sodium hydroxide. a) write the balances reaction. b) determine the amount of water that will be produced. c) would acid or base be left over... more
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Chemistry

05/17/23

How to write an expression for a given equilibrium reaction equation, in terms of the concentrations of products and reactants?
The copper (ii) ion-tetraamine copper (ii) ion equilibrium may be presented by the equation,Cu++ + 4NH3 ⇌ [Cu(NH3)4]++How do I write an expression for the equilibrium constant of this reaction in... more
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Chemistry

05/17/23

How many liters of hydrogen at STP will be produced when 2.36 grams of magnesium react? Mg(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2(g)

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Chemistry

05/16/23

Are you legitimate?
On the better business bureau there are reports that make this seem illegitimate. I need to talk to someone and have more information before inputting any financial information. I am hesitant to... more
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Chemistry

05/16/23

a pure sample of silver has 2.79 X10^23 atoms of silver. What mass of silver is present in this sample
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Chemistry

05/16/23

If 15.9 grams of iron react with 12.8 grams of oxygen gas, how many grams of iron (III) oxide are produced? What is the limiting reactant and what is the excess reactant in this reaction?
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