Please help me solve this biochemistry problems.? - find mole fraction, density, and w/w%
1.) A sample of 6.45g of cysteine 80.1g dissolved in water. Calculate the% w / w cysteine in the solution.
2.) 10 ml of ethanol (p = 0.789 g / ml) is added to produce enough water to 100.0 ml of solution. The density of the solution. 0.982 g / ml We determined the concentration in% volume, mass%, mole fraction and normality.
3.) What is the normality of a solution based on when the water 11.0g of urea (MM = 60.07) per 100 ml of solution?
Sunday, February 21, 2010
Find Mole Fraction, Density, And W/w% Please Help Me Solve This Biochemistry Problems.?
1 comment:
1)% p / pg per 100 g. Therefore, (6.45 g/80.1 g) X 100
2) A% vol / vol, the same idea. 10 mL/100.0 X 100 ml
Need for the mole fraction, convert two moles of molecular weight:
X 10 ml of ethanol (0.789 g / ml) x (1mol/46) g = mol ethanol = Counter
X 90 ml of water (1 g / ml) x (1 mol/18 g) of water = mol
Water + ethanol mol = denominator.
For molarity, mol L solution, then you are given the numerator and the denominator (100 ml)
Convert 3) the same treatment to g (11.0g) at MOL with the GM (60.07g/mol) and dividing by the volume of solution (100 ml)
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