Answer:
520mL
Explanation:
Data obtained from the question include:
Molarity of stock solution (M1) = 12M
Volume of stock solution (V1) = 130mL
Molarity of diluted solution (M2) = 3M
Volume of diluted (V2) =..?
The volume of the diluted solution can be obtained as follow:
M1V1 = M2V2
12 x 130 = 3 x V2
Divide both side by 3
V2 = 12 x 130 / 3
V2 = 520mL.
Therefore, 520mL of the diluted solution can be prepared.
The molecular formula for aspartame is C14H18N2O5, and its molar mass is about 294 g/mol.
Convert 1.2 g into moles, which gives
1.2 g / 294 g/mol = 4.08 X 10-3 moles aspartame.
Since each mole of aspartame has 2 moles of nitrogen, you have 8.16 X 10-3 moles of N in your 1.2 grams of aspartame.
Finally, multiply that by Avogadro's number to get the number of N atoms:
8.16 X 10^-3 mol X 6.02 X 10^23 = 4.9 X 10^21 nitrogen atoms.
13. A
14. B
15. C
16. 1st one (btw not sure)
Answer:
Line A
Explanation:
In consideration of Charles's law of gases, temperature is directly proportional to pressure of the gas.
The ions charge comes from the number of valence electrons. All elements excluding transition metals want to have 8 valence electrons. The first 3 groups will try to lose electrons to get to 8 where as the 5, 6, and 7 ones will try to gain electrons. Hydrogen is to small to get 8 electrons so it settles for 2 like helium because helium is a noble gas. oxygen needs 2 electrons and hydrogen gives one thats hy H is positive H3O is positive and OH is nwgitive.
