A rigid cylinder with a movable piston contains a sample of hydrogen gas. At 350. K, this sample has a pressure of 210. kPa and a volume of 9.50 L. What is the
volume of this sample at STP? (Round your answer to correct number of sig figs)

The volume of this sample at STP is 15.4 L

Explanation:

The combined gas equation is,

where,

= initial pressure of gas =  210 kPa

= final pressure of gas = 101.3 kPa ( at STP)

= initial volume of gas = 9.50 L

= final volume of gas =  ? ( at STP)

= initial temperature of gas = 350 K

= final temperature of gas = 273 K  ( at STP)

Now put all the given values in the above equation, we get:

The volume of this sample at STP is 15.4 L

the answer is barium and copper bromide