Las bocas se coloca un refrigerante en posici ó n de

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las bocas se coloca un refrigerante en posici ó n de destilaci ó n, en otra se coloca un term ó metro y por ultimo  se coloca un embudo de separaci ó n que contiene 7.10g de acido cromico, H 2 CrO 4 . Posteriormente el matraz  de tres bocas se calienta a ebullici ó n con flama suave hasta que los vapores del alcohol lleguen al  refrigerante, en ese momento se agrega la soluci ó n de acido cromico (aproximadamente 2 gotas por  segundo). Controlar la temperatura que registra el term ó metro no debe de pasar de 80-85  ° C. Recibir el  destilado de un matraz Erlenmeyer de 125 ml, sumergido en un ba ñ o maria con hielo. La reacci ó n es la  siguiente: CH 3 CH 2 CH 2 CH 2 OH ´+ H 2 CrO 4                                  CH 3 CH 2 CH 2 COH + Cr + 2H 2 O a) Determine el reactivo limitante, b) determinar el rendimiento te ó rico, c) determinar el porcentaje de  rendimiento de la reacci ó n, si el volumen  obtenido de  Butiraldehido fue de  4.70  ml, la densidad del  butiraldehido es de 0.809 g/ml. Resuelva el problema de forma ordenada, inciso por inciso.
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3.  Balancear la siguiente reacci ó n qu í mica: 4.  i) Explique como llevar í a a cabo las siguientes s í ntesis: a) acetofenona                          cianh í
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