Missouri is about 2.1 times bigger than United Arab Emirates.

United Arab Emirates is approximately 83,600 sq km, while Missouri is approximately 178,414 sq km, making Missouri 113% larger than United Arab Emirates. Meanwhile, the population of United Arab Emirates is ~9.9 million people (3.9 million fewer people live in Missouri).
Tip: This to-scale comparison of United Arab Emirates vs. Missouri uses the Mercator projection, which distorts the size of regions near the poles.