D. They're the main site of photosynthesis in autotrophs.
Answer:. Ca should displace Mn
Explanation:
Calcium is high up in the activity series of metals. Calcium has a very negative redox potential of -2.87 V, next only to potassium. Transition metals of which Manganese is one, does not have such very negative redox potentials so they can easily be displaced by a more highly reactive metal such as Calcium. Elements of group 1 and 2 are very highly reactive.
Answer:
52.36 grams of water was produced when 32 grams of propane was burned in excess of oxygen gas.
Explanation:
Moles of propane =
According to reaction, 1 mole of propane gives 4 moles of water.
Then 0.7273 moles of propane will give:
of water
Mass of 2.909 moles of water:
= 2.909 mol × 18 g/mol = 52.36 g
52.36 grams of water was produced when 32 grams of propane was burned in excess of oxygen gas.
Explanation:
The pH is a scale used to specify how acidic or basic a water-based solution is. A solution with a pH value less than 7 is acidic while a value of above 7 is basic.
However there are no relationships between pH and molecular size. pH is independent of the molecular size.
Answer: The pressure exerted by the gas, in atm is 1.092
Explanation:
According to the ideal gas equation:'
P = Pressure of the gas = ?
V= Volume of the gas
T= Temperature of the gas = (0°C = 273 K)
n= moles of gas =
R= Value of gas constant = 0.0821 Latm/K mol
as
where d is density
Thus pressure exerted by the gas, in atm is 1.092