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1. ### Determine the number of atoms in 1.99 mol Zn. And how do you solve these these types of problems?

I will do the work here, then explain it: 1.99 mole Zn * (6.022 * 10^23/ 1mole.... In order to find the number of atoms in 1.99 moles of Zn, multiply that number by Avogadro...

1 Answers · Science & Mathematics · 16/12/2012

2. ### If you needed to prepare 1.99 liters of a 0.55 M solution of NaOH, how many grams of NaOH do you need?

MV = mass / molar mass (0.55 mol/L) (1.99 L) = x / 40.0 g/mol x = 43.78 g Rounded off to two sig figs, 44 g

1 Answers · Science & Mathematics · 09/10/2012

3. ### how many moles of H2O are in 1.99 x 10^25 molecules of H2O?

a mole is 6.022 x 10^23 particles. particles include atoms or molecules. so in this example we divide 1.99 x 10^25 by 6.022 x 10^23 = 33.0 mol

1 Answers · Science & Mathematics · 09/07/2010

4. ### If 1.99 g of solid magnesium reacts with 100.0 mL of 3.00 M hydrochloric acid, what volume of hydrogen gas is?

Mg + 2 HCl → MgCl2 + H2 (1.99 g Mg) / (24.30506 g Mg/mol) = 0.081876 mol Mg (0.1000 L...

1 Answers · Science & Mathematics · 30/10/2012

5. ### I have 1.99 grams of potassium Iodide. How many moles is this?

...mol KI / 166.0028g) = 0.0119877 mol KI Notice that the grams cancel and you're left with moles. Also, make sure to have the right significant digits (3), which I did not do for you.

2 Answers · Science & Mathematics · 24/05/2011

6. ### HSO4- , pKs = 1.99 Find pKb and Kb?

Since -log(Kb) = pKb, Kb = 10^-pKb. Kb = 10^-12.01 Kb = 9.77 x 10^-13 Hope this helps.

1 Answers · Science & Mathematics · 26/05/2010

7. ### Nuclear Balanced Equation?

92 U 235 + 0n1 ===> 40 Zr 99 + 52 Te 135 + 2 0n1 The atomic numbers must balance on each side. The atomic mass numbers must balance on each side.

1 Answers · Science & Mathematics · 18/10/2011

8. ### What is the change in temperature .....?

really.... 3 grams of it...... all you have to do is divide -1.99/3..... there are 3 grams total... per gram ...

1 Answers · Science & Mathematics · 14/04/2011

9. ### Who can do this Chem problem?

...of the partial pressures of each individual gas in the mixture. 77.7 + 19.94 + 1.99 = 99.68kPa. What is the kiloPascal?. The...

4 Answers · Science & Mathematics · 19/06/2009