CHEMISTRY HELP! IMMEDIATELY?





Question 1 (Essay Worth 3 points)How many grams of chlorine gas (Cl2) are in a 17.8 liter sample at 1.1 atmospheres and 29°C? Show all work used to solve this problem. --------------------------------------… Question 2 (Multiple Choice Worth 3 points)What is true at STP? Temperature is 295 Kelvin. One mole of gas occupies a volume of one liter. Pressure is 1.0 atmosphere. Volume is 2.4 liters. --------------------------------------… Question 3 (Multiple Choice Worth 3 points)Under certain conditions, neon (Ne) gas diffuses at a rate of 4.5 centimeters per second. Under the same conditions, an unknown gas diffuses at a rate of 10.1 centimeters per second. What is the approximate molar mass of the unknown gas? 45 g/mol 9.8 g/mol 4.0 g/mol 2.0 g/mol --------------------------------------…Question 4 (Essay Worth 4 points)How many liters of methane gas (CH4) need to be combusted to produce 12.4 liters of water vapor, if all measurements are taken at the same temperature and pressure? Show all of the work used to solve this problem. CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g) --------------------------------------… Question 5 (Multiple Choice Worth 3 points)Which of the following gases effuses the fastest at a given temperature? Ne CH4 Ar H2 --------------------------------------…Question 6 (Essay Worth 4 points)If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2 Li (s) + 2 H2O (l) 2 LiOH (aq) + H2 (g) --------------------------------------… Question 7 (Multiple Choice Worth 3 points)If 5.0 liters of carbon dioxide gas are produced by the reaction below at STP, how many liters of oxygen gas were used in the reaction? 2 CO (g) + O2 (g) 2 CO2 (g) 10.0 L 7.5 L 5.0 L 2.5 L --------------------------------------…Question 8 (Essay Worth 4 points)How many liters of oxygen gas, at standard temperature and pressure, will react with 35.4 grams of calcium metal? Show all of the work used to solve this problem. 2 Ca + O2 2 CaO --------------------------------------… Question 9 (Multiple Choice Worth 3 points)What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)? 6.4 L 22.4 L 32.0 L 78.4 L



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2 Responses to “CHEMISTRY HELP! IMMEDIATELY?”

  1. maigret says:

    T = 29 + 273 = 302 Kmoles Cl2 = pV/RT = 1.1 x 17.8 / 0.08206 x 302 =0.790mass Cl2 = 0.790 mol x 70.906 g/mol=56.0 gpressure is 1.0 atm4.5 /10.1 = square root x / 20.180.456 = square root x / 20.18x = 4.00 = molar mass unknown = Heliters of methane =12.4/2 = 6.2 LH2moles Li = 21.33 / 6.941 g/mol= 3.07moles H2 = 3.07/2 =1.53V = 1.53 x 0.08206 x 297/ 1.40=26.7 L5.0/2 = 2.5 Lmoles Ca =35.4 / 40.078 g/mol=0.883moles O2 required = 0.883/2 =0.442volume O2 = 0.442 mol x 22.4 L/mol=9.89 Lvolume of O2 = 3.5 mol x 22.4 L/mol=7.8 L

  2. terroristic says:

    These are my answers. Please check before copy anything. I do not want to be blamed for doing quick answers.1. PV=nRTn= 1.1*17.8/[0.08206*(29+273.15)]n= 0.78969 (do not round yet)mass= 0.78969*(35.453*2)= 55.99g = 56.0 g (3 s.f)2. 1 atm3. I don’t know how to do this question.4. since it is taken in same temp. and pressure, the volume can be compared directly. Volume of CH4 = 1/2 of Volume of H2O = 6.2 L5. h26. 21.3g Li * 1mol Li/6.941g Li * 1 mol H2/2 mol Li = 1.53436 mol H2V= nRT/P = 1.53436*0.08206*297/1.40= 26.7108 L = 26.7 L (3 s.f)7. 2.58. 35.4g of Ca * 1 mol Ca/ 40.078g of Ca * 1 mol O2/ 2 mol of Ca * 22.4 L/ 1mol O2 = 9.89 L (3 s.f)9. 78.4