What is the total energy change for the following reaction: H2 + I2 - > 2HI?

Given:

H-H bond: 436 kJ/mol

I-I bond: 151 kJ/mol

H-I bond: 297 kJ/mol

A. + 7 kJ/mol

B. + 297 kJ/mol

C. - 290 kJ/mol

D. - 7 kJ/mol

The mass of a length of metal wire is 45 g. When the wire is placed in a graduated cylinder with water, it displaces 5 mL of water. What is the density of the metal? A. 0.1 g/cm3 B. 9 g/cm3 C. 40 g/cm3 D. 225 g/cm3

For the chemical reaction Na 2 CO 3 + Ca (NO 3) 2 ⟶ CaCO 3 + 2 NaNO 3 how many moles of calcium carbonate will be produced from 91.9 g of sodium carbonate? moles of calcium carbonate:

Based on their chemical formulas which of these compounds is not likely to be an iconic bond KBr, SO2, or AlCl3?

What term represents the change of a substance from the solid phase to the liquid phase?

If you burn 50.6 g of hydrogen and produce 452 g of water, how much oxygen reacted?

Which if the following is an example of a stratovolcano?

There are five elements named for famous scientists on the periodic table

What character acids is that they react with metals to

The energy of a particular color of green light is 3.81*10-22 kJ/photon. The wavelength of this light is nanometers

How many molecules are in. 25 mole of O2