Chemistry please help.? 1. What is the mass, in grams, of 2.20x10^-3 mol of ammonium phosphate? 2. How many moles of chloride ions are in 0.2590g of aluminum chloride? 3. What is the mass, in grams, of 7.60x10^20 molecules of caffeine, C8H10N4O2? 4. What is the molar mass of cholesterol if 0.00105 mol weighs 0.406g?

By: Guest
Date: Sat-Feb-5-2011-
Response
0

Answer 1

1

Mass (NH4)3PO4 = 2.20 x 10^-3 mol x 149.12 g/mol=0.328 g

2

Moles AlCl3 = 0.2590 g / 103.3405 g/mol=0.002506

moles Cl- = 3 x 0.002506 =0.007518

3

Moles caffeine = 7.60 x 10^20 / 6.02 x 10^23 = 0.00126

mass caffeine = 0.00126 mol x 194.19 g/mol = 0.245 g

4

Molar mass = 0.406 g / 0.00105 mol= 386.7 g/mol

[d] By: Guest
Date: Unknown---
Response
What is 1 + 100

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