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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

... 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

...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

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

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

... 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

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

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

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

% 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

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