Answer:
1.9×10²⁴ molecules
Explanation:
Equation of reaction:
SO₃ + H₂O → H₂SO₄
Since the gas is at STP, then we can use ideal gas equation,
PV = nRT
P = pressure of the gas
V = volume of the gas
n = number of moles of the gas
R = ideal gas constant
T = temperature of the ideal gas
P = 1.0atm
V = 68.9L
n = ?
R = 0.082J/mol.K
T = 273.15K
n = PV / RT
n = (1.0 × 68.9) / (0.082 × 273.15)
n = 68.9 / 22.3983
n = 3.076 moles = 3.1 moles
From the equation of reaction,
1 moles of SO₃ will react with 1 mole of H₂O,
Therefore
3.1 moles of SO₃ will react with 3.1 moles of H₂O
Number of moles of SO₃ = 3.1 moles
1 moles = 6.023×10²³ molecules(Avogadro's constant)
3.1 moles = x molecules
X = 3.1 × 6.023×10²³
X = 1.867×10²⁴ molecules
The number of molecules of SO₃ is approximately 1.9×10²⁴ molecules
Answer:
Name Phosphorus
Symbol P
Atomic Number 15
Atomic Mass 30.974 atomic mass units
Number of Protons 15
Explanation:
The correct answer is option C, that is, hypothesis.
The hypothesis is the starting building block in the scientific method. It is also illustrated as an educated guess, based on previous observation and knowledge. A hypothesis refers to a recommended solution for an unexplained event, which does not fit into the present accepted scientific theory.
The fundamental concept of a hypothesis is that there is no pre-determined result. For a hypothesis to be considered as scientific hypothesis, it has to be something, which can be refuted or supported via carefully crafted observation or experimentation.
Answer:
When the Zebra arrived they ate all the food so the Unionid mussels declined as they died from the lack of food. Causing the Zebra Zebra numbers to increase and Unionid numbers to decline.
