Answer:
A landform is a natural or artificial feature of the solid surface of the Earth or other planetary body.
Explanation:
For example, valleys, plateaus, mountains, plains, hills etc.
Answer:
Heating this gas to 55 °C will raise its volume to 6.87 liters.
Assumption: this gas is ideal.
Explanation:
By Charles's Law, under constant pressure the volume of an ideal gas is proportional to its absolute temperature (the one in degrees Kelvins.)
Alternatively, consider the ideal gas law:
.
- is the number of moles of particles in this gas. should be constant as long as the container does not leak.
- is the ideal gas constant.
- is the pressure on the gas. The question states that the pressure on this gas is constant.
Therefore the volume of the gas is proportional to its absolute temperature.
Either way,
.
.
For the gas in this question:
- Initial volume: .
Convert the two temperatures to degrees Kelvins:
- Initial temperature: .
- Final temperature: .
Apply Charles's Law:
.
Phosphorus is in group 15 meaning it have 5 valence electrons. This means that it needs 3 more electrons to create a full outer shell. As these three electrons are negatively charged it means that P is a 3- ion (it’s an anion [negatively charged ion])
Since the given formula is . According to cross method formula, magnesium has +2 charge so, is multiplied by 2.
Thus, 1 molecule of magnesium phosphate will contain 2 atoms of phosphorus.
Therefore, three molecules of magnesium phosphate contains following number of atoms.
Mg = 9
P = 6
O = 24
Hence, we can conclude that there are 6 atoms of phosphorus in three molecules of magnesium phosphate, .