The mass of a particular pt nanoparticle is 6.97 times 10^-20 g. What is the vol
ID: 996643 • Letter: T
Question
The mass of a particular pt nanoparticle is 6.97 times 10^-20 g. What is the volume of the nanoparticle if the density of Pt is 21.4 g cm^-3? (A) 3.07 times 10^20 cm^3 (B) 6.70 times 10^17 cm^3 (C) 1.49 times 10^-18 cm^3 (D) 3.26 times 10^-2t cm^3 8. What is the reading on this graduated cylinder to the correct number of significant figures? (A) 7mL (B) 7.50 mL (C) 7.5 mL (D) 8 mL 9. How many sodium ions are in 25.0 g of Na_2CO_3? (A) 2.84 times 10^23 ions (B) 1.42 times 10^23 ions (C) 7.1 times 10^20 ions (D) 1.13 times 10^20 ions 10. What is the coefficient for ZnO when the reaction is balanced with smallest whole number coefficients?_ZnS +_O_2 rightarrow_ZnO +_SO_2 (A) 4 (B) 3 (C) 2 (D) 1 11. What amount of A1_2O_3 is produced from the reaction of 3.0 mol A1 with 2.0 mol Fe_2O_3? 2A1 + Fe_2O_3 rightarrow A1_2O_3 + 2Fe (A) 6.0 mol (B) 3.0 mol (C) 2.0 mol (D) 1.5 molExplanation / Answer
7) D) 3.26*10-21 cm3
8) B) 7.50 mL
9) A) 2.84*1023 ions
10) C) 2
11) D) 1.5 mol
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