Answer:
5.04%
Explanation:
The accepted value of density = 3.427 g/ml
The calculated value of density = 3.600 g/ml
We need to find Ally's percentage error on her density. The error in any value is given by :
![\%=\dfrac{\text{calculated-accepted}}{\text{accepted}}\times 100\\\\=\dfrac{3.427 -3.600 }{3.427 }\times 100\\\\=5.04\%](https://tex.z-dn.net/?f=%5C%25%3D%5Cdfrac%7B%5Ctext%7Bcalculated-accepted%7D%7D%7B%5Ctext%7Baccepted%7D%7D%5Ctimes%20100%5C%5C%5C%5C%3D%5Cdfrac%7B3.427%20-3.600%20%7D%7B3.427%20%7D%5Ctimes%20100%5C%5C%5C%5C%3D5.04%5C%25)
So, the required error is 5.04%.
The complete balanced reaction for this would be:H3PO4 + 3NaOH ---> Na3PO4 + 3H2OSo we can see that 3 moles of NaOH reacts with 1 mole of H3PO4.
moles NaOH = 0.2 M * 0.05 L = 0.01 molesmoles H3PO4 = 0.01 moles NaOH * (1 mole H3PO4 / 3 moles NaOH) = 0.00333 moles
So the volume required would be:V = 0.00333 moles / (0.200 moles / L)V = 0.0167 L = 16.7 mL
Answer:
.371 mole of NaCl
Explanation:
Na Cl Mole weight = 22.989 + 35.45 = 58.439 g/mole
21.7 g / 58.439 g/mole = .371 mole
The answer is C. Measure from crest to crest.
72 percent is hydrogen. Nuclear fusion converts hydrogen into other elements. The sun is also composed of about 26 percent helium and trace amounts of other elements; oxygen, carbon, neon, nitrogen, magnesium, iron and silicon.
http://www.space.com/17170-what-is-the-sun-made-of.html