• Chemistry Question?

    Zinc metal reacts with hydrochloric acid according to the following balanced equation. Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) When 0.128 g of Zn(s) is combined with enough HCl to make 52.8 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 21.9 ∘C to 24.4 ∘C. Find ΔHrxn for this reaction as... show more
    Zinc metal reacts with hydrochloric acid according to the following balanced equation. Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) When 0.128 g of Zn(s) is combined with enough HCl to make 52.8 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 21.9 ∘C to 24.4 ∘C. Find ΔHrxn for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18 J/g⋅∘C as the specific heat capacity.)
    Chemistry · 5 hours ago
  • Chemistry Question?

    The standard enthalpy of formation for ethanol [CH3COOH(l)] is −484.3 kJ/mol. What is the correct formation equation corresponding to this ΔHof? 2C(s,graphite)+2H2O(g)→CH3COOH(l) 2C(s,graphite)+2H2(l)+O2(l)→CH3COOH(l) 2C(s,graphite)+2H2(g)+O2(g)→CH3COOH(l) 2C(s,graphite)+2H2O(l)→CH3COOH(l)
    The standard enthalpy of formation for ethanol [CH3COOH(l)] is −484.3 kJ/mol. What is the correct formation equation corresponding to this ΔHof? 2C(s,graphite)+2H2O(g)→CH3COOH(l) 2C(s,graphite)+2H2(l)+O2(l)→CH3COOH(l) 2C(s,graphite)+2H2(g)+O2(g)→CH3COOH(l) 2C(s,graphite)+2H2O(l)→CH3COOH(l)
    1 answer · Chemistry · 24 hours ago
  • Chemistry Question Help Please?

    When 1.557 g of liquid hexane (C6H14) undergoes combustion in a bomb calorimeter, the temperature rises from 26.31 ∘C to 38.29 ∘C. Find ΔErxn for the reaction in kJ/mol hexane. The heat capacity of the bomb calorimeter, determined in a separate experiment, is 5.81 kJ/∘C.
    When 1.557 g of liquid hexane (C6H14) undergoes combustion in a bomb calorimeter, the temperature rises from 26.31 ∘C to 38.29 ∘C. Find ΔErxn for the reaction in kJ/mol hexane. The heat capacity of the bomb calorimeter, determined in a separate experiment, is 5.81 kJ/∘C.
    1 answer · Chemistry · 3 days ago
  • Chemistry Question?

    A cylinder equipped with a piston expands against an external pressure of 1.50 atm . If the initial volume is 0.550 L and the final volume is 1.300 L , how much work (in J) is done?
    A cylinder equipped with a piston expands against an external pressure of 1.50 atm . If the initial volume is 0.550 L and the final volume is 1.300 L , how much work (in J) is done?
    1 answer · Chemistry · 3 days ago
  • Chemistry Question Help?

    Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. 2CH3NO2(l)+3/2O2(g)→2CO2(g)+3H2O(l)+N2(g... ΔHorxn = -1418 kJ How much heat is produced by the complete reaction of 7.44 kg of nitromethane?
    Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. 2CH3NO2(l)+3/2O2(g)→2CO2(g)+3H2O(l)+N2(g... ΔHorxn = -1418 kJ How much heat is produced by the complete reaction of 7.44 kg of nitromethane?
    1 answer · Chemistry · 4 days ago
  • Cant get the right answer to a chemistry question?

    A block of copper of unknown mass has an initial temperature of 65.6 ∘C. The copper is immersed in a beaker containing 92.7 g of water at 22.6 ∘C. When the two substances reach thermal equilibrium, the final temperature is 24.5 ∘C. What is the mass of the copper block? Assume that Cs,H2O=4.18J/(g⋅∘C) and Cs,Cu=0.385J/(g⋅∘C). I keep getting 35.1 g... show more
    A block of copper of unknown mass has an initial temperature of 65.6 ∘C. The copper is immersed in a beaker containing 92.7 g of water at 22.6 ∘C. When the two substances reach thermal equilibrium, the final temperature is 24.5 ∘C. What is the mass of the copper block? Assume that Cs,H2O=4.18J/(g⋅∘C) and Cs,Cu=0.385J/(g⋅∘C). I keep getting 35.1 g but its not right
    2 answers · Chemistry · 5 days ago
  • Chemistry Question?

    s the burning of nitrogen to nitrogen(II) oxide exothermic or endothermic? What is the sign of the energy change?
    s the burning of nitrogen to nitrogen(II) oxide exothermic or endothermic? What is the sign of the energy change?
    2 answers · Chemistry · 1 week ago
  • Chemistry Help?

    Assign oxidation states to each atom in each of the following species. Ag Ca^2+ CaF2 HCl NO3^- CrO4^2-
    Assign oxidation states to each atom in each of the following species. Ag Ca^2+ CaF2 HCl NO3^- CrO4^2-
    2 answers · Chemistry · 1 week ago
  • Chemistry Question?

    Enter a molecular equation for the reaction that occurs between aqueous HNO3 and aqueous NaOH.
    Enter a molecular equation for the reaction that occurs between aqueous HNO3 and aqueous NaOH.
    1 answer · Chemistry · 1 week ago
  • Chemistry Help Please?

    Write balanced complete ionic equation for the reaction HCl(aq)+NaOH(aq)→ HF(aq)+NaOH(aq)→ HC2H3O2(aq)+CsOH(aq)→ Write balanced net ionic equation for the reaction HCl(aq)+NaOH(aq)→ HF(aq)+NaOH(aq)→ HC2H3O2(aq)+CsOH(aq)→
    Write balanced complete ionic equation for the reaction HCl(aq)+NaOH(aq)→ HF(aq)+NaOH(aq)→ HC2H3O2(aq)+CsOH(aq)→ Write balanced net ionic equation for the reaction HCl(aq)+NaOH(aq)→ HF(aq)+NaOH(aq)→ HC2H3O2(aq)+CsOH(aq)→
    1 answer · Chemistry · 1 week ago
  • Chemistry Help?

    Complete and balance each of the following equations. If no reaction occurs, enter NOREACTION. NaNO3(aq)+KCl(aq)→ NaI(aq)+Hg2(C2H3O2)2(aq)→ (NH4)2SO4(aq)+SrCl2(aq)→ NH4Cl(aq)+AgNO3(aq)→
    Complete and balance each of the following equations. If no reaction occurs, enter NOREACTION. NaNO3(aq)+KCl(aq)→ NaI(aq)+Hg2(C2H3O2)2(aq)→ (NH4)2SO4(aq)+SrCl2(aq)→ NH4Cl(aq)+AgNO3(aq)→
    1 answer · Chemistry · 2 weeks ago
  • Chemistry Question Help?

    Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NOREACTION. lithium nitrate and lead(II) acetate copper(II) nitrate and sodium sulfate strontium nitrate and sodium sulfate
    Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NOREACTION. lithium nitrate and lead(II) acetate copper(II) nitrate and sodium sulfate strontium nitrate and sodium sulfate
    1 answer · Chemistry · 2 weeks ago
  • Chemistry Question?

    Complete and balance each of the following equations for acid-base reactions. H3PO4(aq)+KOH(aq)→ H2SO4(aq)+LiOH(aq)→ HCl(aq)+Ba(OH)2(aq)→
    Complete and balance each of the following equations for acid-base reactions. H3PO4(aq)+KOH(aq)→ H2SO4(aq)+LiOH(aq)→ HCl(aq)+Ba(OH)2(aq)→
    1 answer · Chemistry · 2 weeks ago
  • Chemistry Question?

    A 31.00 mL sample of an unknown H3PO4 solution is titrated with a 0.100 M NaOH solution. The equivalence point is reached when 28.38 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is H3PO4(aq)+3NaOH(aq)→3H2O(l)+Na3PO4(aq)
    A 31.00 mL sample of an unknown H3PO4 solution is titrated with a 0.100 M NaOH solution. The equivalence point is reached when 28.38 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is H3PO4(aq)+3NaOH(aq)→3H2O(l)+Na3PO4(aq)
    1 answer · Chemistry · 2 weeks ago
  • Chemistry Help, cant figure this out?

    A 15.0 mL sample of a 1.88 M potassium sulfate solution is mixed with 14.4 mL of a 0.900 M barium nitrate solution and this precipitation reaction occurs: K2SO4(aq)+Ba(NO3)2(aq)→BaSO4(s)+2KNO3(aq... The solid BaSO4 is collected, dried, and found to have a mass of 2.48 g . Determine the limiting reactant, the theoretical yield, and the percent yield.
    A 15.0 mL sample of a 1.88 M potassium sulfate solution is mixed with 14.4 mL of a 0.900 M barium nitrate solution and this precipitation reaction occurs: K2SO4(aq)+Ba(NO3)2(aq)→BaSO4(s)+2KNO3(aq... The solid BaSO4 is collected, dried, and found to have a mass of 2.48 g . Determine the limiting reactant, the theoretical yield, and the percent yield.
    1 answer · Chemistry · 2 weeks ago
  • Chemistry Help?

    What is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)
    What is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)
    1 answer · Chemistry · 2 weeks ago
  • Chemistry Help?

    What is the minimum amount of 6.3 M H2SO4 necessary to produce 24.6 g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g)
    What is the minimum amount of 6.3 M H2SO4 necessary to produce 24.6 g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g)
    1 answer · Chemistry · 2 weeks ago
  • Chemistry Question Help Please?

    Consider the following precipitation reaction: 2Na3PO4(aq)+3CuCl2(aq)→ Cu3(PO4)2(s)+6NaCl(aq) What volume of 0.176 M Na3PO4 solution is necessary to completely react with 94.2 mL of 0.119 M CuCl2?
    Consider the following precipitation reaction: 2Na3PO4(aq)+3CuCl2(aq)→ Cu3(PO4)2(s)+6NaCl(aq) What volume of 0.176 M Na3PO4 solution is necessary to completely react with 94.2 mL of 0.119 M CuCl2?
    1 answer · Chemistry · 2 weeks ago
  • Random question about swords?

    How much, or how many times, can you sharpen a sword before it becomes unusable
    How much, or how many times, can you sharpen a sword before it becomes unusable
    9 answers · Martial Arts · 3 weeks ago
  • Chemistry Help?

    Aqueous sodium sulfide reacts with aqueous copper(II) nitrate to form aqueous sodium nitrate and solid copper(II) sulfide. Solid cobalt(III) oxide reacts with solid carbon to form solid cobalt and carbon dioxide gas Gaseous butane (C4H10) reacts with oxygen gas to form carbon dioxide gas and liquid water. Liquid pentane (C5H12) reacts with... show more
    Aqueous sodium sulfide reacts with aqueous copper(II) nitrate to form aqueous sodium nitrate and solid copper(II) sulfide. Solid cobalt(III) oxide reacts with solid carbon to form solid cobalt and carbon dioxide gas Gaseous butane (C4H10) reacts with oxygen gas to form carbon dioxide gas and liquid water. Liquid pentane (C5H12) reacts with gaseous oxygen to form carbon dioxide and liquid water. Express your answer as a chemical equation. Identify all of the phases in your answer.
    1 answer · Chemistry · 4 weeks ago