Mass of nahco3 sample (g): 1.20 g
volume of carbon dioxide produced (ml): 250 ml
8. what is the molecular mass of nahco3?
9. how many moles of nahco3 are in the sample?
10. theoretically, how many moles should be produced from 1.2 grams of baking soda?
11. how many moles of carbon dioxide is produced in the reaction? (use the ideal gas equation, pv=nrt.
for the calculation assuming p= 1 atm; t=298 k and r=0.0821 l-atm/mol-k)
12. what is the percentage error for the experiment?
for items 13 to 20, refer to the following laboratory experiment and results. show your complete
solution for all the questions.
a student weighed 1.25 grams of nahco3 pre-weighed 50 ml beaker. in the fume hood, he slowly
added concentrated hcl to the beaker containing the nahco3. he added a total of 4.6 ml of
concentrated hcl. during the reaction, effervescence was observed due to carbon dioxide formation.
the water by-product was removed by heating the beaker and a white crystalline salt, nacl, is left.
lastly, he took the weight of the residue and the beaker after cooling to room temperature.

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

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.

Is a chemical message sent by another individual.