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1. ### What is the uncertainty for this stopwatch?

Stick with the numbers the stopwatch gives you. Assuming you have a constant reaction time, it will delay the start of the stopwatch just as much as it will delay the stopping of the stopwatch. The stopwatch will give the correct interval to the precision of the stopwatch.

1 Answers · Science & Mathematics · 18/02/2014

2. ### Chemistry help?! Checking answers..?

... for volume in the first one, so your final answer will be in mLs. You're given the density: 13.6g/mL and the mass: 48g to...

1 Answers · Science & Mathematics · 03/02/2014

3. ### Titration help?! Easy question?

...at start of titration and reading at end of titration tells you how many mLs of NaOH solution you used. You need to know the concentration of...

1 Answers · Science & Mathematics · 13/12/2013

4. ### How many mLs of Methanol, Acetone, IPA, ethyl acetate would I need?

ppm is equal to 0.001g/1,000mL so you will need 0.0001g of each for 100mL of ethanol. 1 mL=10^3 µL 0.0001g/density= volume of each to add Methanol=0.0001g/0.791g/mL=1.26 x 10^-4mL=1 x 10^-4 mL=0.1 µL Acetone=0.0001g/0...

1 Answers · Science & Mathematics · 15/12/2013

5. ### How many moles of HCl (hydrochloric acid) are in 60.0 mLs of 0.400 M HCl?

Molarity = # Moles/ # Liters 0.400 M HCl = X Moles/.0600 Liters X Moles = .400 M HCl x .0600 Liters X Moles = 0.024 Moles

3 Answers · Science & Mathematics · 14/12/2013

6. ### Need help with SI unit?

... you solve to get (3.56748 x 10^7 g*mL)/mL. So the mLs cancel out to leave you with 3.56748 x 10^7 g. But don't forget...

1 Answers · Science & Mathematics · 07/12/2013

7. ### How many mLs of 28% by weight of NH2(17.0g/mol) with a density of 0.890 g/ml are needed to prepare 500mL?

mass of NH3 required: (0.250 mol/L) (0.5 L) = x / 17.0 g/mol x = 2.125 g mass of 28% NH3 that contains 2.125 g: 2.125 is to y as 28 is to 100 y = 7.589286 g volume of 7.589286 g of 28% solution: 7.589286 g divided by 0.890 g/mL = 8.53 g...

2 Answers · Science & Mathematics · 20/11/2013

8. ### Chemistry help! I'm stuck!?

37C = 37+273.2= 310.2°K use pV= nRT or n = pV/RT n= 1*0.05/310.2*0.082=1.97*10^-3 mole To find number of molecules multiply by Avogdro's number 6.022*10^23 N= 1.184*10^21 molecules

1 Answers · Science & Mathematics · 15/11/2013

9. ### What does "percent by mass" mean in stoichiometry?

15% by mass means that 15% of the mass of the solution is (NH4)2S. ie, 15 g in 100 g of solution. So you will use it to determine mass, then moles of (NH4)2S provided. mass of solution used = denstiy x volume = 1.2 g/ml x 25 ml = 30 g mass...

1 Answers · Science & Mathematics · 13/11/2013

10. ### What does "percent by mass" mean in stoichiometry?

% by mass means the percentage of element that makes up the mass... Umm how do I explain this... Let's say you have a rectangular block. The rectangular block weighs 200g and the rectangular block is 20%, by mass, gold. That means that out of the 200g, 20...

1 Answers · Science & Mathematics · 13/11/2013