If a leaf is to maintain a temperature of 40� C (reasonable for a leaf), it must lose 180 W/m2 by transpiratio?

If a leaf is to maintain a temperature of 40� C (reasonable for a leaf), it must lose 180 W/m2 by transpiration (evaporative heat loss). Note that the leaf also loses heat by radiation, but we will neglect this. How much water is lost after 1 h through transpiration only? The area of the leaf is 0.006 m2.