a) According to the reaction equation:
CaSO4(s) ↔ Ca2+(aq) + SO4-(aq)
when Kc = [Ca2+][SO4-]
when [Ca2+] = [SO4-] = X
and we have Kc = 2.4 x 10^-5 so ,by substitution we can get [Ca2+]&[SO4-]
2.4 x 10^-5 = X^2
∴X = 0.0049
∴[SO4-] = [Ca2+] = 0.0049 M
b) when we have [Ca2+] = 0.0049 M so we can get the no.of moles of CaSO4:
moles of CaSO4 = molarity * volume
= 0.0049 M * 1.2 L
= 0.00588 moles
when we know the molar mass of CaSO4 = 136.14 g/ mol, So we can get the mass:
∴mass of CaSO4 = moles of CaSO4 * molar mass of CaSO4
= 0.00588 moles * 136.14 g/mol
= 0.8 g
The malleable metal on the periodic table with the atomic number of 79 is gold
Membranes provided significant advantages for the survival of organisms and the replication of their genetic material.
One significant advantage was the ability to better regulate and insulate the cells internal environment from the external environment. The cell had better control over the chemical composition and temperature inside its membrane, which made it easier to survive.
Cells with membranes were able to contain their genetic material, ensuring that, when replicated, it was identical to the parent cell. This meant that organisms with better survivability traits passed on their genetic material in a way that better preserved their genes, and by extension these advantageous traits.
These advantages helped cells with membranes to better survive and replicate, and also enabled the more complex cells with advantageous genetic material to better preserve and copy that material to new cells, allowing for a higher probability of reproduction among more complex life forms.
Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
Answer: A porous black solid, consisting of an amorphous form of carbon, is obtained as a residue when wood, bone, or other organic matter is heated in the absence of air.
Explanation: Charcoal is a lightweight black carbon residue produced by strongly heating wood (or other animal and plant materials) in minimal oxygen to remove all water and volatile constituents. In the traditional version of this pyrolysis process, called charcoal burning, often by forming a charcoal kiln
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