
QUESTION 4 Which is a reasonable mass corresponding to 1040 molecules of a substance? a. 100...
Qustion Campleon Status: QUESTION 7 What is the mass of a 4.110-mol sample of sodium hydroxide? Oa. 98.6 g Ob0.1028 g Oc 164,4 g O d.9.732 g Oe. 40.00 g QUESTION 8 A sample of ammonia has a mass of 89.9 g. How many molecules are in this sample? Oa541 x 1025 molecules Ob.5.28 molecules Oc3.18x 1024 molecules Od 1.14 x 1023 molecules x 10-15, molecules QUESTION 9 A mole of a chemical substance represents Oa.6.02 x 1025 chemical particles...
Question 14 4 pts In which substance does bromine have an oxidation number of +1? A) Br2 B) HBrO C) HBrO2 D) HBr OB OC OD ОА 4 pts Question 15 Identify the place which has the highest boiling point of water.
1. Complete the table. Substance Mass Moles N0. of particle (atoms or molecules) Ar 5.0*10^-4 NO2 1.34*10^20 K 21.4 mg C8H18 2.50 kg 2.Complete The table Substance Mass Moles Number OF particles (atoms or molecules) C6H12O6 19.0 g Pb 8.24*10^21 CF4 24.5 kg C 0.0406 3. Amylose is a "polysaccharide" that plants use to store energy. It is made of repeating subunits of C6H10O5. a. A particular amylose molecule has 2113 of these subunits, what is its molecular formula? Express...
Question 4 4 pts Identify which of the following molecules corresponds to the MS data below. box on zr or be at С D E 100 Molecular ion 116 mass 116 80 60 Rdative htensity 42 81 40 54 20- 0 20 8 8 30 140 160 180 200 100 120 m/z ОА OB Ос D ОЕ OF
23. If 7.50x 104 molecules of a substance have a mass of 454 g, what is the molar mass of the substance? A 6.05 x 10 239 12.5-g mol B. 36.59 C. D. 5.65 x 1039 mol mol mol
O e 1.78 x 10-15 molecules QUESTION 9 A mole of a chemical substance represents .6.02 x 1023 chemical particles of the substance b. the mass of the substance that will combine with 100.0 g of oxygen 0 6.02 x 10-23 grams of the substance d. the mass of the substance that will combine with 12.0 g of carbon QUESTION 10 When the following equation is balanced using the smallest possible integers, what is the number in front of the...
courses Question 5 4 pts Identify which of the following molecules corresponds to the MS data below. sok nyo Joy hoi quando А B С D E 100 59 Molecular ion mass=116 80 57 60 40 101 20 0.0 20 40 60 BO 100 120 m/z ОА B Ос OD OE OF
if
3.011 x 10^23 molecules have a mass of 20.04 grams, what is the
mokar mass if this substance?
8) If 3.011 x 1023 molecules have a mass of 20.04 grams, what is the molar mass of this substance? A) 40.08 g/mol B) 10.02 g/mol C) 20.04 g/mol D) 6.658 x 10-23 g/mol E) none of the above
Question 33 2 pts Which one of the following molecules is polar? (a) BC13 (b) Bel2 (c) CCIA (d) CHCl3 (e) Br2 Ос ОЕ OB OD ОА
Question 19 Not yet answered Flag question Marked out of 1.00 You've diluted a mass of 250 mg bromophenol blue with water, to a volume of 5 ml. What is the concentration of the bromophenol blue solution? Select one: a. 50 ug/ml b. 1.25 ug/ml c. 0.05% d. 50 mg/L e. 12.5% f.5% g. 1.25 mg/ml h.0.5% Previous page Next pag