Answer:0.005M
Explanation:
First deduce the oxidation and reduction half equations and from that obtain the balanced redox reaction equation. From that, the number of moles of reacting species are seen from the stoichiometry of the reaction from which the number of moles of oxalate is obtained and substituted to obtain the molar concentration of oxalate.
Answer:
6.022 × 10²³ molecules of B₂H₆
Explanation:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
B₂H₆ molecules:
21.63 g = one mole of B₂H₆= 6.022 × 10²³ molecules of B₂H₆
Answer:
by arranging the elements according to atomic mass instead of atomic table
Answer:
500ml water
Explanation:
Molarity x Volume in liters (concentrated soln) = Molarity x Volume (diluted soln) ∴
250ml X 12M HCl = 4M x Volume of diluted solution
=> Volume of diluted solution = (250ml)(12M)/(4m) = 750 ml final solution vol. after mixing.
So the amount of water added to the 250ml of 12M acid = 750ml - 250ml = 500ml of water.
It could be because something much larger that we have yet to discover is pulling objects to it like a black hole of something else that we can't see with the human eye.
