(46 POINTS) NEED HELP ASAP 1. The chemical equation below shows the combustion of propane (C₃H₈). The molar mass of oxygen gas (O₂) is 32.00 g/mol. The molar mass of C₃H₈ is 44.1 g/mol. What mass of O₂, in grams, is required to completely react with 0.0125 g C₃H₈?

C3H8 +5O2 --> 3CO2 +4H2O

0.091

0.034

0.045

0.018

2. The molar mass of NaOH is 40.00 g/mol. If 308 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution?

7.69 M

0.260 M

0.0125 M

15.2 M

3. A sample of sodium bromide (NaBr) has a mass of 412.0 g. The molar mass of NaBr is 102.89 g/mol. Approximately how many moles of NaBr does this sample contain?

160.0

40.00

6,400

4.000

4. The following balanced equation shows the formation of ammonia. How many moles of nitrogen (N2) are needed to completely convert 3.06 mol of hydrogen (H2)? *

N2 + 3H2 --> 2NH3

19.02

2.11

1.02

12.68

The wilson chamber is used to study: direction, speed, and distance of radioactivity the intensity of radiation the appearance of individual atoms all of the above

Lem 2 the data below are for the system ethyl propyl ether (1)-chloroform (2) at 0.5 bar. use the data to answer the following questions (all questions refer to p d 0: 5 bar). a) what are the boiling points of the pure components at 0.5 bar? b) a mixture with the overall composition z1 d 0: 1 is brought to 47.6ä±c, 0.5 bar. what is the phase? c) 100 mole of a mixture with z1 d 0: 1 (state a) is mixed with 22 mole of pure ethyl propyl ether vapor (state b). the mixing takes place at 47.6 ä±c, 0.5. bar. what is the phase of the resulting mixture (state c)? if the state is a v/l mixture report the number of moles and mole fractions in each phase. d) plot the txy graph and show states a, b and c. the graph must be done by computer and should be properly annotated. ethyl propyl ether (1) - chloroform (2) at 0.5 bar t ( ä±c) x1 y1 t ( ä±c) x1 y1 42.9 0.000 0.000 49.0 0.470 0.455 43.0 0.020 0.010 49.1 0.520 0.520 43.9 0.065 0.029 48.9 0.567 0.592 45.4 0.156 0.089 48.3 0.652 0.720 46.4 0.215 0.142 47.6 0.745 0.815 47.6 0.296 0.223 46.7 0.822 0.872 48.3 0.362 0.302 45.7 0.907 0.937 48.7 0.410 0.375 44.6 1.000

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025