Answer:
C7H8N4O. The molecular formula C7H8N4O2 (molar mass: 180.16 g/mol) may refer to: Paraxanthine. Theobromine.
The minimum volume of water needed is 0.28 mL. The solution will have
1.7 mg of phthalic acid remaining in solution.
<em>At 100 °C</em>
Volume of water required = 50 mg HPh × (100 mL water/18 000 mg HPh)
= 0.28 mL water
<em>At 25 °C
</em>
Mass of HPh in solution = 0.28 mL water × (620 mg HPh/100 mg water)
= 1.7 mg HPh
the answer is 1.75 i just took the test
A. 599 mg x 1g/1000mg x 1mole/174.24g = 0.003438 moles
<span>b. 0.003438 moles x 1000 mmoles/mole = 3.438 moles </span>
<span>c. 0.003438 moles/0.741 L = 0.0046 M </span>
<span>d. [K+] = 2 x 0.0046 = 0.0092 M because each mole K2 SO4 yields 2 moles K+ </span>
<span>e. [SO42-] = 0.0046 M </span>
<span>f. 599 mg/0.741 L = 808.4 mg/L = 808 ppm </span>
<span>g. 0.599g/741 ml x 100 ml = 0.08 g/100 ml = 0.08% w/v </span>
<span>h. pK+ = -log [K+] = -log 0.0092 = 2.04 </span>
<span>i. pSO42- = -log [SO42-] = -log 0.0046 = 2.34</span>
