Answer: 6.58g
Explanation: We are to find the mass of NaCl that can produce 15% solution in a 750ml
STEP 1:
the reaction moles
NaCl + H2O = NaOH + HCl
Therefore 1mole of NaCl reacts with 1mole of H2O
STEP 2:
convert 750ml to liter
750ml × 1L/1000ml = 0.750L
STEP3 :
convert percentage concentration to mol/L
15% = 0.15mol/L
STEP 4:
find the mole
Mole= concentration× volume
0.15mol/L × 0.75L =0.1125mol
STEP 5 :
Find the mass
Mass = mole × molar mass
The molecular mass of NaCl is 23+35.5= 58.5g/mol
Therefore:
0.1125mol × 58.5g/mol = 6.58g
Approximately: 6.6g
Using the formula 2n² put in the value of n which is 4
the answer is 2×4² which is 2×16
The answer is 32.
this is the maximum no of electron acceptable into the electron shell.
Please mark me as brainliest.
The atomic number of iodine (53) tells us that a neutral iodine atom contains 53 protons in its nucleus and 53 electrons outside its nucleus. Because the sum of the numbers of protons and neutrons equals the mass number, 127, the number of neutrons is 74 (127 − 53 = 74).... i think....
