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jennah daw

jennah d.

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A $0.400-M$ solution of ammonia was titrated with hydrochloric acid to the equivalence point, where the total volume was 1.50 times the original volume. At what pH does the equivalence point occur?

A $0.400-M$ solution of ammonia was titrated with hydrochloric acid to the equivalence point, where the total volume was 1.50 times the original volume. At what pH does the equivalence point occur?

Chemistry

(a) Calculate the percent ionization of $0.0075 M$ butanoic acid $\left(K_{a}=1.5 \times 10^{-5}\right) .$ (b) Calculate the percent ionization of $0.0075 \mathrm{M}$ butanoic acid in a solution containing $0.085 \mathrm{M}$ sodium butanoate.

Chemistry: The Central Science

Questions asked

INSTANT ANSWER

If the final magnification of a compound microscope is -250. Determine the focal length of the eyepiece if an object is placed 6.20 mm from the compound microscope that has a 6.00 mm focal length objective. The objective and eyepiece are separated by 23.0 cm.

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ANSWERED

Ronald Prasad verified

Numerade educator

If the concentrations of each of the following solutions is the same, which has the HIGHEST [H+]? KOH None of these HF NH3 HI Water

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ANSWERED

David Collins verified

Numerade educator

If the X is small assumption is used and the value of X is found to be 0.021, is the X is small assumption valid? What is the percent?

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ANSWERED

Ronald Prasad verified

Numerade educator

A first order reaction is 75% complete in 320 s. What is the value of the rate constant?

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ANSWERED

Chenxi Liu verified

Numerade educator

A first order reaction is 75% complete in 320 s. What is the value of the rate constant?

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ANSWERED

David Collins verified

Numerade educator

Using the following experimental rates: Experiment [N2] [H2] Rate (M/s) 1 0.10 0.25 1.45 x 10-3 If the order of N2 is 2 and the order of H2 is 2, what is the value of k including units?

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INSTANT ANSWER

PCl3 (g) + Cl2 (g) PCl5 (g) H = -285.7 kJ PCl3 (g) + ½O2 (g) Cl3PO (g) H = -84.2 kJ P4O10 (s) P4 (s) + 5 O2 (g) H = -2967.3 kJ 4PCl3 (g) P4 (s) + 6Cl2 (g) H = -1225.6 kJ Calculate H for the reaction: (Be careful about PCl3 vs PCl5) P4O10 (s) + 6PCl5 (g) 10 Cl3PO (g)

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ANSWERED

David Collins verified

Numerade educator

What is the order if: The rate law was determined to be : Rate = k[A]1[B]3[C]1

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ANSWERED

David Collins verified

Numerade educator

For the energy diagram below, if the activation energy in the forward direction is 155 kJ/mol and the H of the reaction is 75 kJ/mol, what is the activation energy in the reverse direction? (if you can not load picture, it is an energy diagram in which the reactants are lower than the products - products at a higher energy)

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ANSWERED

David Collins verified

Numerade educator

If 14 g of sodium metal is dissolved in 300 g of an oxalic acid solution (excess) and initial temperature is 21.2°C, what is the final temperature? Assume specific heat capacity is 4.18 J/°C g. 2 Na (s) + H2C2O4 (aq) Na2C2O4 (aq) + H2 (g) H = -31.9 kJ

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