Take the number of the exponent and move the decimal that many places. If it is positive move it left and if it is negative move it right.
For Example:
2.57x10³= 2570
Fill in any access spaces with zero.
Taking that same number to the negative 3 power
2.57x10^-3
0.00257
I put a 0. to show it is a distinctive decimal.
The correct procedure is:
Dissolving 45 g of NaOH in enough water to make up to 750 mL of solution
<h3>What is molarity? </h3>
This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
<h3>How to determine the mole of NaOH </h3>
- Volume = 750 mL = 750 / 1000 = 0.75 L
- Molarity = 1.5 M
- Mole of NaOH =?
Mole = Molarity x Volume
Mole of NaOH = 1.5 × 0.75
Mole of NaOH = 1.125 mole
<h3>How to determine the mass of NaOH </h3>
- Mole of NaOH = 1.125 mole
- Molar mass of NaOH = 40 g/mol
- Mass of NaOH =?
Mass = mole × molar mass
Mass of NaOH = 1.125 × 40
Mass of NaOH = 45 g
Thus, to obtain 750 mL of 1.5 M NaOH solution, 45 g of NaOH will be dissolved in enough water to make up to 750 mL of solution
Learn more about molarity:
brainly.com/question/15370276
#SPJ1
It’s C. 0.31 atm
I hope this helped out! Have a nice day :)
Answer:
A. Ernest Rutherford
B.Bohr
C. Eugen Goldstein
D.. Santiago Ramon y cajal
E.john Dalton
F.isobars - a line drawn on a weather map connecting points of equal pressure is called isobars.
example.. argon 40
potassium 40
.two differences between isobars and isotopes.
isobars are those elements which have different atomic number but the same mass number. while isotopes are those elements having the same atomic number and different mass number..
two uses of isotopes.
uranium 235 - for nuclear fission and as fuel in unclear reactors.
# an isotope cobalt - used In the treatment for cancer
# an isotope iodine - used in treatment of goiter.