In a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the

condensate.

Explanation.

1) You need a table with the boiling and freezing point of nitrogen to check the states at each given temperature.

2) Since the boling point of nitrogen is - 195.8, you know that at - 170°C it is a gas.

3) Since the freezing point of nitrogen is - 210°C, you know that at - 200°C it is liquid.

4) Then, nitrogen passed from gas to lquid, which is descripted by the condensation process, so it is said that it condensated (the gas became liquid).

A.(nh4)(2co3)is the correct answer