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1. ### chemistry question?

Moles C2H2 = 1.99 x 10^23 / 6.02 x 10^23 =0.331 Moles O2 = 5.81 x 10^23 / 6.02... ( 100 % yield) = 0.331 Molecules = 0.331 x 6.02 x 10^23 = 1.99 x 10^23 % yield = 1.33 x 10^23 x 100 / 1.99 x 10^23 = 67 %

1 Answers · Science & Mathematics · 01/03/2008

2. ### Does anyone know this chem question?

... solution is saturated. 184 ----- = 1.84 100 19.9 ------- = 1.99 10 Soooo.... the resulting solution would be supersaturated...

6 Answers · Science & Mathematics · 07/04/2009

3. ### how many grams of NaOH are in 50 mL of 1.0 mol/L of NaOH?

this is what you do first use this equation to get to moles of naoh...

1 Answers · Science & Mathematics · 06/05/2013

4. ### does any1 know how to do boiling point probs?

...n solute / mass solvent kg ΔTf = Kf(m) ΔTf = (1.99 °C/m)([75.00 g / 106.1 g/mol] / 0.85 kg) ΔTf = 1.65 °...

1 Answers · Science & Mathematics · 22/04/2010

5. ### How to do this Chemistry 1 Honors?

...get E= 1.99 * 10^-20 J/photon. Now, how many photons do you need to add up to get to one kilojoule=1000 joules? 1000J / (1...

1 Answers · Science & Mathematics · 24/10/2011

6. ### How do i solve using Avogadro's Law?

if you remember this... 1) PV = nRT 2) PV/(nT) = R = a universal constant.. then...any PV/nT = any other PV/nT therefore... 3) P1V1 / (n1T1) = P2V2 / (n2T2)....<<...

3 Answers · Science & Mathematics · 07/03/2010

Yes, you did something wrong. The empirical formula should be P2O5. moles ...

2 Answers · Science & Mathematics · 18/04/2011

8. ### Need help with the molarity of solutions?

moles = 2.66 L x 1.99=5.29 moles NaCl = 48.0 g/58.4428 g/mol=0.821 1.50 = 0.821 /V V = 0.548 L = 548 mL

1 Answers · Science & Mathematics · 07/06/2009

9. ### Mass of a Carbon-12 atom...?

It's because your calculator does the following: 1. 12/6.022 = 1.99 2. 1.99*10^23. if you put 12/(6.022*10^23) or if your calculator has the E button you could simply put 12/6.022E23

2 Answers · Science & Mathematics · 13/03/2009

10. ### gen. chemistry conversion question?

use dimensional analysis. aka unit factor or factor label method.... like this. 5.25x10^25 atoms x (1.99x10^-23 g / 1 atom) x ( 1 lb / 454g) = 2.30 lbs

2 Answers · Science & Mathematics · 08/02/2009