Question

In: Chemistry

Enter your answer in the provided box. A sample of zinc metal is allowed to react...

Enter your answer in the provided box.
A sample of zinc metal is allowed to react completely with an excess of hydrochloric acid:
Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)
The hydrogen gas produced is collected over water at 25.0°C. The volume of the gas is 8.45 L, and the atmospheric pressure is 0.951 atm. Calculate the amount of zinc metal in grams consumed in the reaction.
(Vapor pressure of water at 25°C = 23.8 mmHg.)
ANSWER ____ g Zn

Solutions

Expert Solution

Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)

total pressure (PT)   = 0.951atm

vapr pressure of water at 250C ( PH2O) = 23.8/760 = 0.0313atm

pressure of H2 (PH2) = PT - PH2O

                                   = 0.951-0.0313

                                    = 0.9197atm

V   = 8.45L

T   = 25+273 = 298K

PV = nRT

n = PV/RT

     = 0.9197*8.45/0.0821*298

      = 0.3176moles

Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)

1 mole of H2 produced from 1 mole of Zn react with HCl

0.3176 moles of H2 produced from 0.3176 moles of Zn react with HCl

mass of Zn = no of moles * gram molar mass

                    = 0.3176*65.4 = 20.77g of Zn >>>>answer


Related Solutions

Enter your answer in the provided box. Many metals react with oxygen gas to form the...
Enter your answer in the provided box. Many metals react with oxygen gas to form the metal oxide. For example, calcium reacts as follows: 2Ca(s) + O2(g) → 2CaO(s) Calculate the mass of calcium oxide that can be prepared from 6.87 g of Ca and 4.58 g of O2. _____ g
Enter your answer in the provided box. A 1.70−g sample of water is injected into an...
Enter your answer in the provided box. A 1.70−g sample of water is injected into an evacuated 4.50−L flask at 40.0° C. What percentage of water will be vapor when the system reaches equilibrium? Assume ideal behavior of water vapor and that the volume of liquid water is negligible. The vapor pressure of water at 40.0° C is 55.3 mmHg. An answer should be in percent.
Enter your answer in the provided box. A 58.92−g sample of water at 74.9°C is added...
Enter your answer in the provided box. A 58.92−g sample of water at 74.9°C is added to a sample of water at 25.3°C in a constant-pressure calorimeter. If the final temperature of the combined water is 42.8°C and the heat capacity of the calorimeter is 26.3 J/°C, calculate the mass of the water originally in the calorimeter.
Enter your answer in the provided box. What is the emf of a cell consisting of...
Enter your answer in the provided box. What is the emf of a cell consisting of a Pb2+ / Pb half-cell and a Pt / H+ / H2 half-cell if [Pb2+] = 0.96 M, [H+] = 0.017 M and PH2 = 1.0 atm ?
Enter your answer in the provided box. Calculate the pH at the equivalence point for the...
Enter your answer in the provided box. Calculate the pH at the equivalence point for the following titration: 0.40 M HCOOH versus 0.40 M NaOH.
Enter your answer in the provided box. The solubility of N2 in blood at 37° C...
Enter your answer in the provided box. The solubility of N2 in blood at 37° C and at a partial pressure of 0.80 atm is 5.6 × 10−4 mol/L. A deep-sea diver breathes compressed air with the partial pressure of N2 equal to 3.8 atm. Assume that the total volume of blood in the body is 4.8 L. Calculate the amount of N2 gas released (in liters at 37° C and 1.00 atm) when the diver returns to the surface...
Enter your answer in the provided box. Determine the pH of (a) a 0.15 M NH3...
Enter your answer in the provided box. Determine the pH of (a) a 0.15 M NH3 solution. (b) a solution that is 0.15 M NH3 and 0.40 M NH4Cl. Kb for NH3 is 1.8 × 10−5
Enter your answer in the provided box in scientific notation. A hydrogen-like ion is an ion...
Enter your answer in the provided box in scientific notation. A hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by En = −(2.18 × 10−18J) Z2 (1/n2) where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its...
Enter your answer in the provided box. Henry's law constant for CO2 at 38 ° C...
Enter your answer in the provided box. Henry's law constant for CO2 at 38 ° C is 2.28 × 10−3 mol / L · atm. Calculate the pH of a solution of CO2 at 38 ° C in equilibrium with the gas at a partial pressure of 8.05 atm.
Enter your answer in the provided box. The pH of a bicarbonate-carbonic acid buffer is 7.28....
Enter your answer in the provided box. The pH of a bicarbonate-carbonic acid buffer is 7.28. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3−). (Ka1 of carbonic acid is 4.2 × 10−7.) [H2CO3] [HCO3−] =
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT