2.53 Sighting along the C2-C3 bond of 2-methylbutane (see Problem 2.52), there are also two possible eclipsed conformations. Draw them both in Newman projections, tell which you think is lower in energy, and explain.

The sum of the numerals in the name of (see picture) is 20? 7? 21? 14? 8?

Hf728ca7011b52e183d2247#10001 Part A 15. ΑΣΦ The physician has ordered 1.0 g of tetracycline to be given every six hours to a patient. If your stock on hand is 500-mg tablets, how many will you need for one day's treatment? Express the number of tablets as an integer. Submit ? Previous Answers Request Answer 12 of 15 tablets Review | Constants | Periodic Tab

Write the correct answer with 1 place after the decimal point What is the molecular mass of C6(N8O4)6

The radius of a tantalum atom is 142 pm. How many tantalum atoms would have to be laid side by side to span a distance of 1.87 mm? atoms

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An iron atom has a mass of 9.27 × 10 - 23 g and a cooking pot has a mass of 0.500 kg. Use this information to answer the questions below. Be sure your answers have the correct number of significant digits x10 What is the mass of 1 mole of iron atoms? 5.58 x 10 g How many moles of iron atoms have a mass equal to the mass of a cooking pot? .900

Na (g) + CI(g) + e 4502 kl/mol 355 kl/mol Na(g) + CI(g) Na*(g) + CH(g) +121 kl/mol Na(g) + 1/2 Cl;(g) ki/mol -786 kl/mol Na(s) + 1/2 Cl2(g) -411 kl/mol NaCI(s) The ionization energy of Na (g) is -411 kJ/mole 502 kJ/mole -355 kJ/mole -786 kJ/mole

Consider these compounds: А. СоСОз В. AдBr C. Fe2S3 D. Caз(РOд)2 Complete the following statements by entering the letter(s) corresponding to the correct compound(s). (If more than one compound fits the description, include all the relevant compounds by writing your answer as a string of characters without punctuation, e.g, ABC.) Without doing any calculations it is possible to determine that barium phosphate is more soluble than and barium phosphate is less soluble than It is not possible to determine whether barium phosphate is more or less soluble than by simply comparing Ksp values.

The radius of a spherical aluminum atom is 140 pm. How many aluminum atoms could fit lines across the verticle length of this page? (vertical length= 27.82 cm)