Question

7. How many milligrams of iron metal must react with excess HCl to produce 46.0 ml of H2(g), measured at 55°C and 745 torr? 2F + 6HCl → 2FeCl(aq) + 3H 8. If all the gas in a neon tank is used to fill 2500 balloons with a volume of 2.5L, what is the mass of neon in the tank? 9. A study of the effects of certain gases on plant growth requires a synthetic atmosphere composed of 2.0g CO2, 1.8g 02, and 8.0g Ar. Calculate the partial pressure of O, in the mixture if the total pressure of the atmosphere is to be 715 torr. 10. Calculate the volume of a 1.00 L sample of gas after its pressure is decreased by 20% and its absolute temperature is decreased by 2%.

Answer 1

2 Fe + 6HCl 2Fecs +3 H2 Mdar 55.85 Mass Stoichionety 1.9 (2x55.85) T- 55 c= 328 K P745 t06 atm x 745 toot 760 to 745 tor 0.9803 atm PV= nRT 0.98023x46x103 atm n=PV RT 0.0821 X328K Vastin mot Tn 1.64450 mo

fe greautid 3mol H oduced wohen 11 xl 6745 x10 m 111-9 3 m6i l0.06235 . G745xmol 11 006235a of fe must aut form Require d moles
in milligram = 62.35 mg