B. is positive
H20 (l)--> H20 (g)
when that happens, the heat is absorbed into the liquid to change the state of the liquid to gas; therefore, in order to change to a gaseous state, heat must be a reactant. and so enthalpy is increasing
Answer:
Explanation:
Hello,
In this case, the first step is to compute the moles of carbon in the sample that are contained in CO2 only at the products as shown below:
Next the moles of hydrogen contained in the H2O only:
Now, we compute the mass of oxygen in the sample, by subtracting mass of both carbon and hydrogen from the 3.626 g of sample:
And the moles:
Now, the mole ratios by considering the moles of oxygen as the smallest:
Thus, empirical formula is:
Regards.
Explanation:
Atomic number of Silicon..=14
2.-> At the equivalence point, the pH = 7.00 for strong acid- strong base titrations.
3.-> A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions.