Question

What is the pH of a 0.054 M HCl solution?

What is the molarity of 30.0 mL of a 0.660 M NaOH solution after it has been diluted to 150.0 mL? Show all work .

How many moles of gas are there in a gas-filled balloon, which has a volume of 67.0 L at a pressure of 780mmHg and a temperature of 25.0°C? Show all work   

Calculate the molar mass of methanol, CH₃OH

Answer 1

pH of 0.054 HCl pH -log [ 4t HCl- Ht + ci O osum 0.05UM PH -10g (0.054) -(-1.2676) PH 1.27 PM 입 0.054M HCl is 1.27 Molarity of 3071 of 0.660M Naole after dilution diluted Initially concentration (A) = Volume (vi) 0.660M M = ? va - Ưo| 3omi dilution principle TA, V = Mak + M VI Mi Scanned with CamScanner

20.660M) ( Jomi) 2. 150 m) M2 = 0.132M . diluted Naok solution Concentration = 0. 132M Balloon filled with gas moles Volume (V) = 671, Temperature - TE950 pressure (P) = 780mmig = 25+273 T = 298k we know latm = 760mm Hg .. (180" wa) en RE -1.0 263 atm TGommHg 0.0821 L-atm) Himol gas constant ideal gas equation PV = nRT n PV RT 11.0263 atm) (674) n- (0.08a1 10.0821 L-atm H. mel) (2484) ne 2.81 mol 2.8 mol Moles of gas (n) = 2.8 mol C Scanned with CamScanner

Molar mass of chok 12+ 40 + 16 chy oh molar mass CHUO 0 - 12+ 4+16 39 g/mol ... СНО HOH molay mass = 329/mol csscanned with CamScanner