determine the standard enthalpy of formation (in kj/mol) of calcium carbonate (δhf°) from the thermochemical equations given below.

Can you me find area of the shaded region?

Case # 51173878 weighs 814 pounds; case # 51173981 weighs 803 pounds; case # 51174058 weighs 817 pounds; case 51174178 weighs 815 pounds; case # 51174248 weighs 817 pounds; case # 51174495 weighs 781 pounds; case # 51174577 weighs 828 pounds. what are the case #'s of the two cases that weigh the same amount?

Which element contributes to nye’s voice in this passage