01/11/22

For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 19.9 moles of methane, CH4 ?
For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 19.9 moles of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4, report... more
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01/11/22

For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 19.9 moles of methane, CH4 ?
For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 19.9 moles of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4, report... more
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01/11/22

For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 7.9 moles of methane, CH4 ?
For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 7.9 moles of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4, report... more
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01/11/22

S   +   6 HNO3 →  H2SO4  +  6 NO2  +   2 H2O
S   +   6 HNO3 →  H2SO4  +  6 NO2  +   2 H2OIn the above equation, how many grams of water can be made when 13.6 moles of HNO3 are consumed?Round your answer to the nearest tenth. If you answer is... more
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01/10/22

Find the excess reagent(s)
Sulfur dioxide can be scrubbed from smokestack emissions with the following reaction:2 SO2(g) + 2 CaCO3(s) + O2(g) → 2 CaSO4(s) + 2 CO2(g)Based on this chemical equation, which reagent(s) should be... more
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01/10/22

How many Liters of gas would be found in a 8.146 g of Carbon Dioxide
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01/10/22

Stoichiometry- extraction of gold from its ore
To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water.4Au(s) + 8NaCN(aq) + O2 (g) + 2 H2O(l) → 4NaAu(CN)2 (aq) + 4NaOH(aq)a) Determine... more
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01/10/22

Determine the following concentrations when 7.48 g of nitric acid (HNO3) is dissolved in 125 mL of aqueous solution.
Determine the following concentrations when 7.48 g of nitric acid (HNO3) is dissolved in 125 mL of aqueous solution.Moles of HNO3 dissolved per liter = [H+]in soln.= [NO3–]in soln.= 
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01/10/22

You have a 1.153 g sample of an unknown solid acid, HA, dissolved in enough water to make 20.00 mL of solution. HA reacts with KOH(aq) according to the following balanced chemical equation:
You have a 1.153 g sample of an unknown solid acid, HA, dissolved in enough water to make 20.00 mL of solution. HA reacts with KOH(aq) according to the following balanced chemical... more
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01/09/22

Kj of heat needed to convert a liquid to gas
What amount of heat (in kJ) is required to convert 10.1 g of an unknown liquid (MM = 83.21 g/mol) at 19.2 °C to a gas at 93.5 °C? (specific heat capacity of liquid = 1.58 J/g･°C; specific heat... more
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01/07/22

Concentration of Solutions Quiz
1) a) What volume of 0.375 mol/L potassium carbonate could be prepared if you diluted a         975.0 mL solution with a concentration of 0.850 mol/L? (3 marks)b) What volume of water would have to... more
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01/07/22

Alcohol solute problem
You need a 40% alcohol solution. On hand, you have a 450 mL of a 30% alcohol mixture. You also have 90% alcohol mixture. How much of the 90% mixture will you need to add to obtain the desired... more
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01/07/22

Alcohol solution problem
You need 260 mL of a 95% alcohol solution. On hand, you have a 35% alcohol mixture. How much of the 35% alcohol mixture and pure alcohol will you need to obtain the desired 95% solution?
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01/07/22

2 NaN3(s) ---> 2 Na(s) + 3 N2(g) Nitrogen gas has a density of 0.629 g/mL at 30°C. How many grams of NaN3 are required to make 4.0 gal of Nitrogen gas.

2 NaN3(s) ---> 2 Na(s) + 3 N2(g)Nitrogen gas has a density of 0.629 g/mL at 30°C. How many grams of NaN3 are required to make 4.0 gal of Nitrogen gas. 
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01/07/22

Given the following Ions: BrCl5 CO32-
Given the following Ions: BrCl5 CO32-a) Draw all the possible Lewis structures for the following ions.b) Assign formal charges to each atom in each resonance structurec) indicate the most plausible... more
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01/07/22

Why are neutrons always more than protons in an atom?
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01/07/22

For the hypothetical reaction A(g) ⟶ B(g), use the graph shown below to find the average rate of reaction for both A and B at the point in the reaction when the concentrations of A and B are equal.
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01/06/22

equations and reactions summary
Calculate the concentrations of the ion(s) indicated in each of the following solutions.[Al^+3] and [SO4^-2] in 0.080 M Al2(SO4)3
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01/06/22

equations and reactions summary
For each of the following ionic solids, write a balanced overall equation to show their formation from their elements. Write two balanced half reactions showing the oxidation and reduction process... more
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01/06/22

Molality and Molec Weight Questions
A stu‎dent was ins‎tructed to de‎termine the mol‎ecular w‎eight of an unkn‎own white ‎powd‎er. He remem‎bered th‎at one w‎ay to d‎o this is by e‎xploiting the collig‎ative properti‎es of solut‎ion.... more
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01/06/22

Enthalpy Questions
The ent‎halpy of neutral‎ization of a new‎ly discov‎ered co‎mpound, J(OH‎)3, w‎as deter‎mined usin‎g a styrob‎all calori‎meter. The calo‎rimeter wa‎s firs‎t calibr‎ated using 13.‎00 mL of 0.1‎04 M... more
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01/06/22

Why do electrons in stable orbits/energy levels of the Bohr's atomic model not radiate energy??
Referring to Bohr's atomic model.
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01/06/22

For the following redox reaction: MnO₄⁻ (aq) + Ni (s) → MnO₂ (s) + Ni²⁺ (aq). Show how you would balance the reaction if it were in an acidic solution.

For the following redox reaction: MnO₄⁻ (aq) + Ni (s) → MnO₂ (s) + Ni²⁺ (aq). Show how you would balance the reaction if it were in an acidic solution. 
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01/06/22

CHEMISTRY QUESTION
Nickel metal, Ni (s), was left in a solution of aluminum (III) ions (Al³⁺), iron (II) ions (Fe2⁺), and copper (II) ions (Cu²⁺). What reaction is most likely to be spontaneous? Write a balanced... more
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01/05/22

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1.3g of zinc metal is dropped into 15g of hydrochloric acid (HCl) to produce a gas at STP. After the reaction, some acid remained. Find the mass of the remaining acid. 
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