Which one these samples contains the smallest number molecules? a. 1.0 L of H_2

Question

Which one these samples contains the smallest number molecules? a. 1.0 L of H_2 at STP (0^degree C and 1 atm) b.1.0 L of N_2 c. 1.0 L of H_2 at 20^degree C and 760 torr d. 1.0 L of N_2 at 0^degree C and 800 torr e. 1.0 L of He at STP In an experiment, 25.0^degree C mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0^degree C. The balloon is then cooled to 5.0^degree C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions? a.17.5 mL b. 20.1 mL d.31.1 mL e. 35.7 mL

Explanation / Answer

55)

a)   STP conditions P = 1 atm , T = 273 K

     P V = n RT

n = P V / RT = 1 x 1.0 / 0.0821 x 273

n = 0.0446

b)

n =   (800 / 760) x 1 / 0.0821 x 273

n = 0.0470

c)

n = 0.0446

d)

760 torr = 1 atm

T = 20 + 273 = 293 K

n = P V / R T

   = 1 x 1 / 0.0821 x 293

n = 0.0416

e)

n = 0.0446

among all d) has smallest number of moles . so it has smallest number of molecules also

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.