Hola, podrían reseolverme estos problemas? Principalmente el último. Gracias

1. Al mezclar una disolución acuosa de CaCl2 con otra de AgNO3 se forma un precipitado de cloruro de plata:

Se mezcla un volumen de 15,0 ml de una disolución 0,30 M de CaCl2 con 30 ml de una disolución 0,05 M de AgNO3. Calcula los gramos de AgCl que precipitarán.
2. Determina el grado de pureza de un mármol (CaCO3) si al descomponerse 125 g del mismo se desprenden 20 litros de dióxido de carbono medidos a 15 ºC y 1 atm.
3. A partir de 120 g de KClO3 se obtuvieron a 18 ºC y a la presión de 740 mmHg, 20 L de oxígeno. ¿Cuál fue el rendimiento de la reacción?

4. Para la obtención de bromobenceno se hacen reaccionar 300 cm3 de benceno (d = 0,89 g/cm3) en exceso de bromo.

Determina la masa de bromobenceno obtenido si el rendimiento de la reacción es del 65 %.

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %