A balloon filled with 0.5 L of certain gas at 23°C and 0.46 atm was placed inside a refrigerator. On opening the refrigerators after few hours, the volume
and the pressure of a gas was found to have changed to 0.3L and 0.7 atm respectively. Determine the temperature inside the refrigerator.​

i'm pretty sure its b i might be wrong though!

the answer is barium and copper bromide

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally