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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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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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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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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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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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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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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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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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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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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05/16/23

Question: Combustion Of 5.000g Of An Unknown Hydrocarbon Resulted In 15.14g Of CO2 And 7.751g Of H2O. What Is The Empirical
Question: Combustion Of 5.000g Of An Unknown Hydrocarbon Resulted In 15.14g Of CO2 And 7.751g Of H2O. What Is The Empirical formula
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05/15/23

A metal with a specific heat of 0.900 J/g oC requires 610 J of heat to raise the temperature (the change in temperature) by 25 oC. What is the mass of the metal?

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05/15/23

the molar masses indicated in the table below. Given a compound with a composition of 49.1% Q and 50.9% Z by mass, what is the empirical formula of this compound?

Three elements, A, Q, and Z, have the molar masses indicated in the table below. Given a compound with a composition of 49.1% Q and 50.9% Z by mass, what is the empirical formula of this... more
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05/15/23

In an endothermic reaction at equilibrium, if you decrease the temperature, what will happen? 
In an endothermic reaction at equilibrium, if you decrease the temperature, what will happen? : the amount of reactant and product will stay the same more product will be formed more... more
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05/15/23

Rachel burns a 53 gram cracker under a soda can filled with 58.3 grams of water. She took the temperature of the water before she began
Rachel burns a 53 gram cracker under a soda can filled with 58.3 grams of water. She took the temperature of the water before she began -- it was 7.8 degrees Celsius. After the cracker was done... more
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05/15/23

What is the maximum mass of ammonia that can be formed when 43.88 grams of nitrogen gas reacts with 10.62 grams of hydrogen gas

What is the maximum mass of ammonia that can be formed when 43.88 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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05/15/23

After the cracker was done burning, the temperature of the water was 60.3 degrees Celsius. How many calories of heat were released by the cracker?

Rachel burns a 53 gram cracker under a soda can filled with 58.3 grams of water. She took the temperature of the water before she began -- it was 7.8 degrees Celsius. After the cracker was done... more
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05/15/23

What is the pH of a buffer made from 0.035 mol of HBrO (Ka= 2.5 x 10-9) and 0.120 mol of KBrO in 1.0 L of solution
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05/14/23

What is the resulting hydronium ion concentration and the resulting molarity of the base solution of a given reaction?
10 cm3 of a 2M solution of nitric acid (HNO3 (aq) ) is added to 10 cm3 of a 1M solution of calcium hydroxide (Ca(OH)2 (aq) ) solution.a)    What is the resulting total volume?b)    What is the... more
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05/14/23

If instead 0.0100 M of W, 0.0150 M of X, 0.0250 M of Y, and 0.000515 M of Z are mixed, determine the equilibrium concentrations of all species (Keq still equals 4.43 X 10-7)
If instead 0.0100 M of W, 0.0150 M of X, 0.0250 M of Y, and 0.000515 M of Z are mixed, determine the equilibrium concentrations of all species (Keq still equals 4.43 X 10-7). (assumption is needed... more
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05/13/23

what mass of CO2 can be produced?

Given the equation below, 13.58 grams of Fe2O3, and excess CO, what mass of CO2 can be produced? Please round the answer to two digits after the decimal point.Fe2O3 + 3 CO = 2 Fe + 3 CO2
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05/13/23

Which of these solutions has the highest boiling point?
Which of these solutions has the highest boiling point? 3 M CH4 3 M SrF2 3 M CaF 3 M N2
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05/13/23

How many moles ?
How many moles of C6H12O6 are needed to produce 22.78 grams of CO2? Round your answer to three digits after the decimal point.C6H12O6 + 6 O2 = 6 CO2 + 6 H2O
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05/13/23

How many calories of heat were released by the cracker?
Rachel burns a 53 gram cracker under a soda can filled with 58.3 grams of water. She took the temperature of the water before she began -- it was 7.8 degrees Celsius. After the cracker was done... more
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05/13/23

What is the pressure of the sample?
A student has a sample of 1.66 moles of fluorine gas that is contained in a 27.7 L container at 297 K. What is the pressure of the sample? The ideal gas constant is 0.0821 L*atm/mol*K. Round your... more
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