CREATE TABLE table_2271 ("-Butadiene" TEXT, "10 4 k /min \\u22121  ( 30 \\u00b0C )   ( \\u00b1 1-2% )  absolute" TEXT, "10 4 k /min \\u22121  ( 30 \\u00b0C )   ( \\u00b1 1-2% )  relative" TEXT, "\\u0394H \\u2021 /kcal mol \\u22121" TEXT, "\\u0394S \\u2021 /cal mol \\u22121 K \\u22121" TEXT)

Name the number of s /cal mol 1 k 1 for butadiene being 1,2-dimethylene-cyclohexane
SELECT COUNT("\u0394S \u2021 /cal mol \u22121 K \u22121") FROM table_2271 WHERE "-Butadiene" = '1,2-dimethylene-cyclohexane'
SELECT COUNT("\u0394S \u2021 /cal mol \u22121 K \u22121") FROM "table_2271" WHERE "-Butadiene" = '1,2-dimethylene-cyclohexane'