Help me answer these questions pls asap.

You open a can of soda at room temperature and hear a hiss. which of the following factors has changed inside the container? a.) atmospheric pressure b.) temperature of gas c.) type of gas d.) amount of gas

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

At the current rate, a graph of carbon dioxide produced by fossil fuels over time would slope upward slope downward be horizontal be vertical