Necesito ayuda con estequiometria CALCULA LOS MOLES DE CROMO SI HAY 28.5 g DE Cr2O3 (OXIDO DE CROMO)
Cr2O3 + Al = Cr + Al2O3

CALCULA LA MASA DEL CLORURO DE SODIO (NaCl) SI HAY 1.25 MOL DE CLORO
EN LA ECUACIÓN.
Na + Cl2 = NaCl

necesito procedimientos, gracias :D

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?