One million argon atoms ismol mol (rounded to two significant figures) of argon

Question

One million argon atoms ismol mol (rounded to two significant figures) of argon atoms.1 A) 60 1023 B)1.0.10-6 O^ 1.7 10-18 D) 1.0 10+6 E)3.0 How many moles of pyridine (CsHsN) are contained in 3.13 g of pyridine? 2) A) 25.3 B) 0.0396 C) 0.319 D) 4.04 103 E) 000404 5) How many molecules of CH4 are in 48.2 g of this compound? A) 4.00 B)3.00 )5.00 1024 D) 290 1025 E) 1.81 1024 4)The total number of atoms in 0.1 1 1 mol of Fe(CO3(PHshi, A) 446 1021 B) 15.0 C) 2.76 10-24 D) 1.00 1024 E) 1.67 5) How many moles of sodium carbonate contain 1.773·1017 carbon atoms? 5) 0)2945 10-7 B) 1.473 10-7 C9817 10-8 D) 5.890 - 10-7 E) 8836 10-7 of aspartame, the gemeric name of NutraSweet , is CistisN20s. The 6) The molecular formula of aspartame, the generic name of N The 6) rounded to the nearest integer, is B) 294 molar mass of A) 156 C) 43 D) 24 E) 39 7) A nitrogen oxide is 6365% by mass nitrogen. The molecular formula could be 7) A) N20 B) N204 C) No2 D) NO E) either NO2 or N204

Explanation / Answer

1. C

2. B

3. E

4. D

5. A

6. B

7. A

8. E

9. C3H8 + 5o2 ---> 3co2 + 4H2O

No of mol of CO2 produced = 38/44 = 0.86 mol

No of mol of PROPANE = 22.05/44 = 0.5 mol

No of mol of propane reacted = 0.86/3 = 0.286 mol

percent yield = 0.286/0.5*100 = 57.2%

answer: E

10. 2CH3OH + 3O2 ---> 2CO2 + 4H2O

oXYGEN coefficient = 3

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