The graph below shows the volume and the mass of four different substances at stp.
which of the four substances has the lowest density?
(1) a
(2) b
(3) c
(4) d

Density is defined as the ratio of mass to the volume at standard temperature and pressure. In the graph, substance D will have the lowest density.

Formula of Density:

In the given graph, the substances A, B, C, and D, are measured on the graph.

From the formula, it can be interpreted as density is inversely proportional to volume and directly proportional to the mass. The density will be decreased if volume is decreased, and also, if mass is increased, then density will be increased.

Reasons for incorrect answers:

Therefore, D has the lowest density.

To know more about density, refer to the following link:

link

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.