Compressed Natural Gas (CNG) has the same chemical composition as that of:

Compressed Natural Gas (CNG) has the same chemical composition as that of:

Explanation

Compressed natural gas (CNG) has the same chemical composition as methane, which is the primary component of Sui gas: 

Chemical formula

The chemical formula for CNG is CH4, which is also the chemical formula for methane. 

Composition

Sui gas is made up of 60–90% methane, 0–20% ethane, 0–20% propane, and 0–20% butane