1, propane: molecular weight is 44.096.

2. Acetylene: molecular weight is 26.04.

Second, the melting point is different.

1, propane: melting point is-187.6℃.

2. Acetylene: melting point is -8 1.8℃.

Third, the use is different.

1, propane: propane is often used as fuel for barbecues, portable stoves and motor vehicles; Used as fuel or compressed gas in some flame throwers.

2. Acetylene: Acetylene is used in the carburizing (hardening) process of iron. Studies in the past decade have found that acetylene is the most suitable hydrocarbon for this purpose. Acetylene can inhibit nitrification and denitrification.

Refer to the above contents: Baidu Encyclopedia-acetylene, Baidu Encyclopedia-propane.