Questionn 4
4 nh3(g) + 3 o2(g) - 2 n2(g) + 6h20(9)
if the standard molar heats of formation of ammonia, nh3(g), and gaseous water, h2o(9), are -46 kj/mol and -242 kj/mol, respectively,
what is the value of ah 298 for the reaction represented above?

Fission of uranium-235 products energy and a. isotopes of smaller elements b. isotopes of larger elements c. lighter isotopes of uranium d. heavier isotopes of uranium

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3