Am I right? Sample 1 2 3 Calculations for sample 1 Mass of aluminum dish 1.24g 1.26g 1.24g - Mass of aluminum dish + Epsom salt 1.70g 1.94g 1.80g - Epsom salt, original (hydrated) mass 0.46g 0.68g 0.56g 1.70g – 1.24g = 0.46g Mass of aluminum dish + Epsom salt after heating 1.42g 1.62g 1.61g Epsom salt, heated (dehydrated) mass 0.18g 0.36g 0.37g 1.42g- 1.24g = 0.18g Mass of water 0.28g 0.32g 0.19g 0.46g – 0.18g = 0.28g Moles of magnesium sulfate 0.0015mol 0.0030mol 0.0031mol 0.18g x (1mol/120.37g)= 0.0015mol Moles of water 0.016mol 0.018mol 0.011mol 0.28g x (1mol/18.02g) = 0.016mol Ratio of moles water: moles of magnesium sulfate 32:3 18:3 11:3.1 0.016 : 0.0015= 32:3 Average Ratio Knowing that magnesium sulfate is heptahydrate, what is the % error on the mass percentage of water? Show all calculations. --> percentage error: 30.43% 1) Heptahydrate : MgSO4 : H2O = 1:7 Percentage of water in the heptahydrate = moles of H2O / (moles of MgSO4 + H2O) x100 = 7 / (1+7) x 100 = 87.5% 2) |measured value – true value| / |true value| x 100 |60.87% - 87.5%| / 87.5% = 30.43%
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Am I right?
|
Sample |
1 |
2 |
3 |
Calculations for sample 1 |
|
Mass of aluminum dish |
1.24g |
1.26g |
1.24g |
- |
|
Mass of aluminum dish + Epsom salt |
1.70g |
1.94g |
1.80g |
- |
|
Epsom salt, original (hydrated) mass |
0.46g |
0.68g |
0.56g |
1.70g – 1.24g = 0.46g |
|
Mass of aluminum dish + Epsom salt after heating |
1.42g |
1.62g |
1.61g |
|
|
Epsom salt, heated (dehydrated) mass |
0.18g |
0.36g |
0.37g |
1.42g- 1.24g = 0.18g |
|
Mass of water |
0.28g |
0.32g |
0.19g |
0.46g – 0.18g = 0.28g |
|
Moles of magnesium sulfate |
0.0015mol |
0.0030mol |
0.0031mol |
0.18g x (1mol/120.37g)= 0.0015mol |
|
Moles of water |
0.016mol |
0.018mol |
0.011mol |
0.28g x (1mol/18.02g) = 0.016mol |
|
Ratio of moles water: moles of magnesium sulfate |
32:3 |
18:3 |
11:3.1 |
0.016 : 0.0015= 32:3 |
|
Average Ratio |
|
|
- Knowing that magnesium sulfate is heptahydrate, what is the % error on the mass percentage of water? Show all calculations.
--> percentage error: 30.43%
1) Heptahydrate : MgSO4 : H2O = 1:7
Percentage of water in the heptahydrate = moles of H2O / (moles of MgSO4 + H2O) x100 = 7 / (1+7) x 100 = 87.5%
2) |measured value – true value| / |true value| x 100
|60.87% - 87.5%| / 87.5% = 30.43%
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