mozart symphony 41 allegro vivace?

Sonata form.
Virtually all first movements of late Eighteenth Century symphonies are in sonata form.

Here I am following this videotape:
http://uk.youtube.com/watch?v=d1m8CyBMluo&feature=related

EXPOSITION
beginning--first theme
1:26 second theme
2:32 codetta

REPEAT EXPOSITION
3:01 first theme
4:22 second theme
5:27 codetta

DEVELOPMENT
5:56
6:52 pseudo-recapitulation in subdominant

RECAPITULATION
7:31 first theme
8:51 second theme
9:57 codetta (this time called a coda)

Don't get fooled at 6:52. This is a "pseudo-recapitulation," in which the composer deceives the listener into thinking the recapitulation is about to start. Rather, the recapitulation starts in the tonic at 7:31.

This trick has fooled not only students, but at least one writer, who wrote that Mozart wrote a "subdominant recapitulation" both in the C major sonata, K 545, and here. Mozart really did write a subdominant recapitulation in K 545, but not here.

Sonata form.

sonata form.

Here is a rough explaination about sonata form:

A typical sonata form movement consists of a two-part tonal structure, articulated in three main sections. The first section (‘exposition’) divides into a ‘first group’ in the tonic and, after transitional material, a ‘second group’ in another key (usually the dominant in major movements, the relative major in minor ones), often with a codetta to round the section off. Both groups may include a number of different themes. In 18th-century music the exposition is almost always directed to be repeated.

The second part of the structure comprises the remaining two sections, the ‘development’ and ‘recapitulation’. The first usually develops material from the exposition in a variety of ways, moving through a number of keys. Compared with the exposition, this section is usually one of considerable tonal instability and of rhythmic and melodic tension. It also prepares the structural climax, the ‘double return’ to the main theme and to the tonic key which begins the recapitulation. This final section restates the themes of the exposition, usually in the same order; the second group is now heard in the tonic (possibly tonic major if the movement is minor), and there may be temporary excursions to other keys. Before 1780 the second part (development and recapitulation) was usually directed to be repeated. After that date this repetition became increasingly rare; the finale of Beethoven's ‘Appassionata’ Sonata furnishes a late example.

To the above outline of sonata form may be added a slow introduction and a coda. The primary function of the introduction is to strike a more serious or grander tone and to establish a larger scale of motion than would be possible by the Allegro alone. A coda usually restates the main theme, and most codas include some emphasis on the subdominant, especially if none has occurred in the recapitulation.

Sonata form is absolutely correct. Sometimes it is called "sonata allegro form."

What do you mean? Do mean if it's Binary form or Ternary form. Or do you mean Orchestral structure. It's hard to give you an answer when the question isn't very clear.