The number of significant figures in the number 0.010210 is: 2; 4; 5; 3; 6 A 0.0
ID: 996681 • Letter: T
Question
The number of significant figures in the number 0.010210 is: 2; 4; 5; 3; 6 A 0.032 mol sample of gas occupies a volume of 350ml at 300K What is the pressure of the gas? 0 00225 atm; 22.4atm; 0 228atm; 2 25atm; 228atm ....10.0 liters of CO_2 at 25 degrees is confined in a piston What is the new volume of CO2, if the temperature is raised to 50 degrees while the pressure on the piston is held constant? 12.5 liters; 5.0 liters; 20.0 liters; 5.4 liters; 10.8 liters For the neutralisation reaction between HC2H302(aq) and NaOH(aq), the net ionic equation contains all of the following species except: H+(aq); HC2H302(aq); H2O; OH(aq); C2H302-(aq) When mixing equal volumes of 0.2 M lead nitrate and 0.2 M potassium carbonate solutions no net reaction will occur; a gas will be evolved; a precipitate will form; neutralization will occur; decomposition will occur The number of significant figures that should be reported for the mass of a sample obtained by taking the difference between the mass of a sample plus beaker (75.652g) and the mass of the beaker (74 9g) is: 4; 3; 5; 2; 1Explanation / Answer
18) The significant digit in 0.010210 is 5.
19)0.032 mol of gas occupy a volume of 350mL;
PV=nRT; P*0.35=0.032*0.0821*300 ; P=2.25 atm.
20) PV=nRT; at constant P, n equation modifies to V=K.T or V/T = constant
so V1/T1=V2/T2; 10/298=V2/323 ; V2=323*10/298= 10.839 L . option e.
21) Neutralisation of acetic acid with NaOH give H+, OH-, CH3COO-, Na+, H2O.
But there wont be any acetic acid left. so answer is CH3COOH.
22) When leadnitrate and potasium carbonate is mixed, they form precipitate of insoluble Leadcarbonate.
23)75.652-74.9= 0.752 so significant digit are 3.
24) The hybridisation of Br in BrF5 is (42/8); 5 bond + 1 lone pair= sp3d2
25)process is endothermic, heat is absorbed.
26) water is polar compound.
27) +800KJ
28) C
29) data not provided.
30) N2O5= dinitrogen pentaoxide.
31)13.6 g/mL=13.6 kg/L so answer is none of the above.
32) 3,3,-3,-1/2 is not possible.
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