Answer:
1.17 grams
Explanation:
Let's consider the balanced equation for the combustion of ethylene.
C₂H₄(g) + 3 O₂(g) → 2 CO₂(g) + 2 H₂O(l)
We can establish the following relations:
- 1411 kJ are released (-1411 kJ) when 1 mole of C₂H₄ burns.
- The molar mass of C₂H₄ is 28.05 g/mol.
The grams of C₂H₄ burned to give 59.0 kJ of heat (q = -59.0 kJ) is:
Answer:
How many atoms of each element are there in one molecule of H3PO4? there are 8 atoms in total in H3PO4. there are 3 atoms of hydrogen, 1 atom of phosphorous and 4 atoms of oxygen in the one molecule of this compound, which is called hydrogen phosphate.
A. How religion and philosophy different
All the other choices (b-d) can be explained by science while a can be explain by history I think
Answer:
0.0329g of quinine
Explanation:
If 25.0ppm of quinine solution had a fluorescence of 193, the solution that had a fluorescence of 127 has as concentration:
127 × (25.0ppm / 193) = <em>16.45ppm</em>
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As the solution was diluted from 50.0mL to 200.0mL, the sample tonic of water contains:
16.45ppm × (200.0mL / 50.0mL) = 65.8 ppm
As the original solution contains 500.0mL, mass of quinine is:
0.5000L × (65.8mg / L) = 32.9mg ≡<em> 0.0329g of quinine</em>
