Add this snippit to the functions.php of your Genesis child theme to change to full width page layout and remove the sidebar.

gistfile1.php

// Remove sidebar and add new body class to front page.
add_action ( 'get_header', 'pasada_full_width');
function pasada_full_width() {
    if ( is_front_page() ) {
        remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
        add_filter ( 'body_class', 'pasada_test' );
    }
}

// Add body class.
function pasada_test( $classes ) {
    $classes[] = 'full-width-content';
    return $classes;
}