Chemistry solving problems Science Assignment Help. Chemistry solving problems Science Assignment Help.

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Aspirin (C_{9}H_{8}O_{4}) is produced from salicylic acid (C_{7}H_{6}O_{3}), and acetic anhydride (C_{4}H_{6}O_{3}), as shown below.

C_{7}H_{6}O_{3} + C_{4}H_{6}O_{3} → C_{9}H_{8}O_{4} + HC_{2}H_{3}O_{2}

_{}What is the theoretical yield of aspirin if 181 kg of salicylic acid is allowed to react with 124 kg of acetic anhydride?

If the situation described in part (c) produces 173 kg of aspirin, what is the percentage yield?

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e.What is the wavelength in the traveling sound wave produced in the outside air?

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A 54-dB sound wave strikes an eardrum whose area is 5.0*10^-5m^2 . The intensity of the reference level required to determine the sound level is 1.0*10^-12W/m^2.1 year=3.156*10^7s .

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There is a government budget surplus if

a. T - TR > G.

b. G > T.

c. G > TR.

d. TR < T

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The trace of a square matrix A is the sum of the diagonal terms of A and is denoted by tr(A).

(a) Find a 3×3 matrix A with nonzero entries suchthat tr(A) = 0.

(b) If A and B are both n x n matrices, show that tr(A + B) = tr(A) + tr(A).

(c) Show that tr(A) = tr(AT ).

(d) Select two nonzero 2×2 matrices A and B of your choosing, and check if tr(AB) = tr(A)tr(B).

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At a rock concert, a dB meter registered 126dB when placed 2.7m in front of a loudspeaker on the stage. The intensity of the reference level required to determine the sound level is 1.0*10^-12 W/m^2.

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Aspirin (C_{9}H_{8}O_{4}) is produced from salicylic acid (C_{7}H_{6}O_{3}), and acetic anhydride (C_{4}H_{6}O_{3}), as shown below.

C_{7}H_{6}O_{3} + C_{4}H_{6}O_{3} → C_{9}H_{8}O_{4} + HC_{2}H_{3}O_{2}

_{}(a) How much salicylic acid is required to produce 1.0 10^{2} kg of aspirin, assuming that all of the salicylic acid is converted to aspirin?

(b) How much salicylic acid would be required if only 56% of the salicylic acid is converted to aspirin?

(c) What is the theoretical yield of aspirin if 181 kg of salicylic acid is allowed to react with 124 kg of acetic anhydride?

All

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True: All the cost would be considered in order to determining the cost of acquisition till the expense upto installation.

**14. True**: Yes, when the repair provides the economic benefit more than a year than it should be considered as capital Expenditure.

**15. False**, Except land all the tangible assets are subject to depreciaton

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1.What fundamental frequency would you expect from blowing across the top of an empty soda bottle that is 24 cmcm deep, if you assumed it was a closed tube? The speed of sound in air is 343 m/s.f1 emprty=

b.What fundamental frequency would you expect if the bottle was filled with soda for height of 10cm ? f1 not empty=

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## Chemistry Stoichem Problems Science Assignment Help

Detonation of nitroglycerin proceeds as shown in the following equation.

4 C_{3}H_{5}O_{9}N_{3}(*l*) → 12 CO_{2}(*g*) + 6 N_{2}(*g*) + O_{2}(*g*) + 10 H_{2}O(*g*)

(a) If a sample containing 1.97 mL of nitroglycerine (density = 1.592 g/mL) is detonated, how many total moles of gas are produced?

(b) If each mole of gas occupies 43 L under the conditions of the explosion, how many liters of gas are produced?

(c) How many grams of N_{2} are produced in the detonation?

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