Is thermal energy transferred from the dry ice to the water or from the water to the dry ice?

From the water to the dry ice

Explanation:

The energy is transferred from the water to the dry ice because the water is warmer than the dry ice.

Energy is transferred from the water to the dry ice.

Explanation:

Water is a lot warmer that the dry ice, so energy is being transferred from the water to the dry ice making it go from a solid to a gas.

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