Answer:
The answer is
<h2>20 %</h2>
Explanation:
The percentage error of a certain measurement can be found by using the formula
From the question
actual volume = 35 mg
error = 35 - 28 = 7
The percentage error is
We have the final answer as
<h3>20 %</h3>
Hope this helps you
Answer:
A
Explanation:
I think this is true letter a
Mol = # atoms ÷ Avagadaro's number (6.02×10^23)
mol = 2.4×10^24 ÷ 6.02×10^23
mol = 3.986 mol
Answer:
Explanation:
You have the equation. Now change the 3.4 g H2 to moles. moles = grams/molar mass
<em>3.4 g/2.016 = 1.686 moles.</em>
Now using the coefficients in the balanced equation, convert moles H2O2 to moles H2O.
1.686 moles H2 x (2 moles H2O/2 moles H2O2) = 1.686 x (2/2) = 1.686 x (1/1) = 1.686 moles H2O.
Now you know that 1 mole of water is composed of 6.022 x 10^23 molecules. So
1.686 moles H2O x (6.022 x 10^23 molecules H2O/1 mole H2O) = ?? molecules.