Time Altitude Pressure Temperature Volume Moles 9:00 pm 40 km 9.54 x 10 atm 115,580 L 9:10 pm 20 km 9.89 x 10° atm 25°C 117,860 L 1. Determine the temperature at 9:00 pm (Assume constant n). Show your solutions below. Justify your answer by providing an explanation of the process on how you were able to calculate the amount of gas.

A solution is made by mixing 101. g of acetic acid (HCH, CO,) and 24. g of methanol (CH,OH). Calculate the mole fraction of acetic acid in this solution. Be sure your answer has the correct number of significant digits.

A student experimentally determines the gas law constant, R, by reacting a small piece of magnesium with excess hydrochloric acid and then collecting the hydrogen gas over water in a eudiometer. Based L-atm on experimentally collected data, the student calculates R to equal 0.0832 mol·K L-atm Ideal gas law constant from literature: 0.08206 mol·K (a) Determine the percent error for the student's R-value. Percent error = % (b) For the statements below, identify the possible source(s) of error for this student's trial. The student notices a large air bubble in the eudiometer after collecting the hydrogen gas, but does not dislodge it. The student does not clean the zinc metal with sand paper. The student does not equilibrate the water levels within the eudiometer and the beaker at the end of the reaction. The water level in the eudiometer is 1-inch above the water level in the beaker. The student uses the barometric pressure for the lab to calculate R.

There are three sets of sketches below, showing the same pure molecular compound (carbon monoxide, molecular formula CO) at three different temperatures. The sketches are drawn as if a sample of carbon monoxide were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of CO: -205, °C boiling point of CO: -192. C A (Choose one) (Choose one) (Choose one) B A 11111 A -178. °C 1 2 3 4 5 1 1 -178. °C 11 B 2 3 -211. °℃ B 2 3 1 -211. °C I C 199. °C C لڑنے 199. °C

Please help me

Please see question 28, just the top one. I figure in this system the pressure is changing and my answer is the original pressure divided by the final pressure is equal to X.  Do I have this correct?     pv= nRT      N and T and R are constants   thus P1V1 = P2V2.