Answer:1600
Explanation because the conversion from cm to mm is just times 10
<span>the answer:
The net ionic equation,
H3PO4 (aq) + 3 OH− (aq)------- PO4−3 (aq) + 3 H2O (l),
</span> H3PO4 is a strong acid, (presence of hydrogen H)
OH- is a strong base, (presence of OH-)
so the true answer is <span>strong acid-strong base</span>
According to the definition of half-life, the mass of the radioactive isotope halfs its mass after each half-life, which means the remaining mass is always half the amount of the previous mass.
Therefore, after the 1st half-life, there is (190/2) g left; after the 2nd half-life, there is (190/2)/2 g left; so on and so forth. After the 6th half-life, there is 190/(2*2*2*2*2*2) g = 190g/64 = 2.97 g left.
So 2.97 g of this radioactive isotope will be left after 6 half-lives.
Answer:
The number of moles of calcium atom in each mole of calcium carbonate is 1 mole of calcium atoms
Explanation:
The chemical formula for CaCO₃ = 100.086 g
The number of molecules in one mole of a substance is given by the Avogadro's number,
= 6.022 × 10²³ molecules
The number of calcium atoms in one molecule of CaCO₃ = 1 atom of calcium
Therefore, the number of calcium atoms in 1 mole of CaCO₃ = 1 × 6.022 × 10²³ atoms of calcium = 6.022 × 10²³ atoms of calcium
6.022 × 10²³ atoms of calcium = The number of toms in 1 mole of calcium atoms
Therefore, the number of moles of calcium atom in each mole of calcium carbonate = 1 mole of calcium atoms.