No. of mmol =M.Wt (mg/mmol)Example : How many moles and millimoles of benzoic acidcontained in 2.00 g of the pure acid?Solution: If we use HBz to represent benzoic acid, we can writemass of 122.1g.amount of HBz = ( 2.00 g / 122.1 g/mol )= o.0164 mol HBz.To obtain the number of millimoles, we divide by the millimolar mount HBz = ( 2.00g / o.1221 g/mmol )= 16.4 mmol HBz.H.W.:1. Calculate the number of grams in one mole of CaSO7H2O ?(Atomic weight Ca=40 ,S=32 ,0=16 ,H=1 ).2. Calculate the number of moles in 500 mg Na,SO,?.(MW of Na,SO,=293.8 mg/mmol).Dr. Marwa NizarAL-Hadbaa University College2. Molecular Weight (M.wt): of a substaof the atomic weights (AW) of the elemolecular, each taken the number of timОссurs.Example: Calculate the M.Wt. for :CH3COOH = 2C + 4H + 20= 2X12 + 4x1 + 2X16= 60 g.H.W: Calculate the M.Wt. for:Ca(OH), , NaHCO,, MgSO,7H2O34°Dr. Marwa NizarAL-Hadbaa University College

Calculation of molecular weight.

Answered: H.W: Calculate the M.Wt. for : Ca(OH),…

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Chemistry

H.W: Calculate the M.Wt. for : Ca(OH), , NaHCO,, MgSO,-7H2O 4

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter15: Solutions

Section: Chapter Questions

Problem 27CR

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Question

No. of mmol =
M.Wt (mg/mmol)
Example : How many moles and millimoles of benzoic acid
contained in 2.00 g of the pure acid?
Solution: If we use HBz to represent benzoic acid, we can write
mass of 122.1g.
amount of HBz = ( 2.00 g / 122.1 g/mol )= o.0164 mol HBz.
To obtain the number of millimoles, we divide by the millimolar m
ount HBz = ( 2.00g / o.1221 g/mmol )= 16.4 mmol HBz.
H.W.:
1. Calculate the number of grams in one mole of CaSO7H2O ?
(Atomic weight Ca=40 ,S=32 ,0=16 ,H=1 ).
2. Calculate the number of moles in 500 mg Na,SO,?.
(MW of Na,SO,
=293.8 mg/mmol).
Dr. Marwa Nizar
AL-Hadbaa University College
2. Molecular Weight (M.wt): of a substa
of the atomic weights (AW) of the ele
molecular, each taken the number of tim
Оссurs.
Example: Calculate the M.Wt. for :
CH3COOH = 2C + 4H + 20
= 2X12 + 4x1 + 2X16
= 60 g.
H.W: Calculate the M.Wt. for:
Ca(OH), , NaHCO,, MgSO,7H2O
3
4°
Dr. Marwa Nizar
AL-Hadbaa University College

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