05/19/20
What is the concentration of bromide ion if 25.0 ml of a 0.50 M AlBr3 solution combines with 40.0 ml of a 0.35 M NaBr solution?
I converted AlBr3 and NaBr to moles however, I'm not so sure what to do after that. I know the final answer for the concentration of bromide ion is 0.79 mol/L. Can someone please help ?AlBr3 =...
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05/19/20
Can someone please tell me if there is an easier way to answer this question? and if I did it correctly please.
A 2.32g sample of Na2SO4*nH2 yields 1.42g Na2SO4 upon heating. What is the value of n?Na2SO4*nH20--->Na2SO4(s)+nH20(g)Molar Mass Na2SO4 =142 g/molMolar Mass H2O = 18.016 g/molI'm not sure if I...
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05/19/20
Need help with quarantine homework
If we were to add 0.02 moles of HCl and 0.01 moles of KOH to make up a1 liter solution, what ions would be remaining after reaction and whatwould be the pH of that liter of solution?
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05/19/20
Setting up a one-step unit conversion
A student sets up the following equation to convert a measurement.Fill in the missing part of this equation.(-2.6*10^4 g*m^2/s^2) * [ ? ] = ? kg*m^2/s^2
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05/19/20
Deducing the unit missing from the solution to a basic quantitative problem
A student sets up and solves the following equation to solve a problem in solution stoichiometry.Fill in the missing part of the student's equation.(1.28 g/mL)(1mL/10^-3 L) / (123.17 [ ?]) = 10.4...
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05/19/20
Half life help!
How much of a 1.00 g polonium -214 sample remains after 818 microseconds? The half life of polonium -214 is 163.7 microseconds. Round to the correct number of significant figures and use units (g)
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05/18/20
Half life help!
If the half life of Technetium -104 is 18.0 minutes, how much of a 165.0 g sample will be left after 90.0 minutes. Round to the correct number of significant figures and use units (g)
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05/18/20
Half life help!
Your original sample of Manganese -56 is 20.0 mg. How much is left after 3 half lives. Round to the correct number of significant figures and use units (mg)
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05/18/20
Half life help!!
How long is 5 half lives if the half life is 2.6 hours? Round to the correct number of significant figures and use units (hours)
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05/18/20
Half life help!
Manganese -56 has a half life of 2.6 hours. How many half lives are there in 24 hours? Round to the correct number of significant figures and use units (half-lives)
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05/18/20
Find the pH of a solution whose hydronium concentration is 1.0 x 10-12. Input your answer with no decimal places.
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05/18/20
Find the pH of a solution whose H+ concentration is 6.0 x 10-5. Input your answer with two decimal places.
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05/18/20
Find the pH of a solution whose H+ concentration is 6.0 x 10-5
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05/18/20
Combined gas law problems
I can’t understand this question and I’m hoping someone can assist me with itA 4.0 mole sample of gas occupies 4.4 liters at STP, which is 273 k and 1 atm. If more gas is added to the balloon the...
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05/18/20
What basic equation is used to calculate the pH of a solution? (
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05/17/20
Calculate enthalpy change
Use values for the standard enthalpies of formation to calculate the enthalpy change for the reaction below:2NH3(g)+3O2(g)+ CH4(g) → 2HCN(g) +6H2O(g)Give the quantity and unit (kJ) and don't forget...
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05/17/20
copper metal + nitric acid nitrogen dioxide + water + copper (II) nitrate
What is the Complete equation, then balance?
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05/17/20
Sulfric Acid reacts with C12H22O11 to remove water and leave carbon behind
What is the balanced equation?
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05/17/20
When heated mercury (II) oxide decomposes into its elements.
What is the balanced equation?
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05/17/20
magnesium + oxygen
1.) What is the complete balanced equation?
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05/17/20
iron + copper (II) sulfate
a small piece of iron into a test tube containing 1-2 ml of 1.0 M copper (II) sulfate solution1.) What is the complete balanced equation?2.) What are the oxidation numbers?3.) What are the half...
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05/17/20
Zinc + Hydrochloric Acid
a small piece of zinc into a test tube containing 1-2 ml of 1.0 M hydrochloric acid solution1.) What is the complete balanced equation?2.) What are the oxidation numbers?3.) What are the half...
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05/16/20
What is the total pressure at equilibrium?
At 250 °C, Ke = 1.58 x 10‒8 for the following equilibrium: NH2COONH4 (s) ⇌ 2 NH3 (g) + CO2 (g)If 7.80 g of NH2COONH4 is put into a 0.500-L evacuated container, what is the total pressure at...
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