Use Avogadro's number which is numerically equal to ...
( 6.02 multiply by 10 to the power of negative 23)
Avocado's number is the number of particle(molecules, ions, atoms) present in one mole of substance.
number of molecule in 0.809 mole of h20 = ....
one mole of h20 contains (6.02* 10^-23)
0.809 mole contains....(6.02* 10^-23) (0.809)
which is equal to [4.951* 10 ^-23]
if I made no mistake in calculation...it must be correct
A is the answer
The process of forming tow DNA molecules for one is called replication
Answer:
10.5g of KBr
Explanation:
molarity = moles of solute / litres of solution
we are given the volume of the solution in milliliters but the formula uses litres so we have to convert
to convert to liters we divide the number of milliliters by 1000 ( because 1 liter has 1000 milliliters. )
so liters of solution = 92.7/1000 = 0.0927 L
we can now plug in what we are given and solve for moles of solute
recall molarity = moles of solute / litres of solution
molarity = 0.955M and liters of solution = 0.0927L
so
multiply both sides by 0.0927
we're left with moles of solute = 0.0885285 moles
Finally we must convert moles to grams
Molar mass of KBr = 39.0983 + 79.904 = g/mol
Using dimensional analysis we get
the mol KBr cancel out on both sides and we get which is equal to 10.5g (rounded)
So we can conclude that 10.5g of KBr is dissolved in 92.7mL of a 0.955M solution.
Answer:
chemical change occur when a substance combines with another to form a new substance.
Explanation:
hope this helps ;)
<span>Half Cell Reaction:
ClO3¯ ---> Cl2
Cl¯ ---> ClO2</span>
Balance them:
<span>10e¯ + 12H+ + 2ClO3¯ ---> Cl2 + 6H2O
2H2O + Cl¯ ---> ClO2 + 4H+ + 5e¯</span>