Question

mpiest whole number Yat mento a campound color formula: Chemistry 151 Week 5 - Moles, Atoms, Grams Which of the following represents the least number of molecules Show all won 6) 20.0 g of H0 b) 77.0 g of CH. c) 68.0 g of Calg 7. Og of chy 20.0g of H2O 5. What is the smallest mass that can be measured using the top-loading balance? What is the smallest mass that can be measured using the analytical balance? (You may need to complete this question in lab!) I have no clue

Answer 1

Solution 9 @ Melarmass of water (H20) = 2X1+ 16 B = 18g/mol mass of H2O = Rog (given) As we know, - Avogardro's number = 6.02X1223 So we can say that H₂O contains 6.02X10?s molecules ii Rog Heo contains 6.02X12" mcelicules X pog = 6.69 X 1023 molecules 6 Molarmass of CH4 = 12 + 4x1 = 16 g/mol mass of CH4 = 77g (given) so we can say that " 16g (Hy contains 6.02x10 23 molecules :, 779 CHy contains 6.02x102 molecules X79 169 = 28.97 X 1023 molecules © Molarmass of Cat₂ = 40 + 2X1 = ५२9/ved Scannmassofono cah, - 689 (given) mass o Scanned with CamScanner

uzg So we can say that " 42g Catz contains 6-02X1033 molecules ii 689 Ca Ha contains 6.02 X 1023 molecules X689 = 9.75X1023 molecules 20g H₂O contains 6.69 x 1023 molecules 779 CHy contains 28.97X1623 mielecules 689 Cate contains 9.75 X 1023 molecules Ans:- 20g H₂O contains least number of molecules. ③ Top loading balance These type of balances can I weigh to an accuracy of tling and it is suitable for weighing the amount that are specified for two or three significant figures. Analytical balance. These type of balances can weight to an accuracy of tooling and it is suitable for weighing the amount that are specified for four or more significant figures. Scanned with CamScanner