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Calculate change in enthalpy of reaction (delta H) for the reaction.?
Calculate change in enthalpy of reaction (delta H) for the reaction
4 NH3 (g) + 5 O2 (g) -----> 4 NO (g) + 6 H2O (g),
N2 (g) + O2 (g) ---> 2 NO (g) DH = -180.5 kJ
N2 (g) + 3 H2 (g) ---> 2 NH3 (g. DH = -91.8 kJ
2 H2 (g) + O2 (g) ---> 2 H2O (g) DH = -483.6 kJ
1 AnswerChemistry8 years agoA known volume of a solution prepared by dissolving a known mass of zinc chloride to a final volume of 100.0 m?
The volume of the titrant, EDTA, needed to complex free Zn2+ in the sample is used to calculate the #moles of Zn in the sample, and indirectly, the moles Cl present.
Which of the following mathematical operations gives you the mass of chlorine in the sample titrated?
mass = mass of sample titrated - mass of Zn complexed
mass = mass zinc chloride x volume of sample titrated
100.0 mL
mass = #moles EDTA used to titrate sample X (1 mole Zn / 1 mole EDTA) X molar mass of zinc
volume EDTA x [EDTA] (moles / L) x (1 mole Zn / 1 mole EDTA)
1 AnswerChemistry8 years agoOnce a soluble ionic salt has dissolved, polar solvent water acts to ____ the free ions and keep them apart in?
precipitate
solvate
spectator ions
dissociate
net ionic equation
2 AnswersChemistry8 years agoWhich of the following is unlikely to dictate whether a compound will be flammable?
a)that any atom in it can hydrogen-bond with water
b)that the molecule is composed of hydrogen and carbon
c)the number of hydroxyl groups compared the carbon content
d)that the molecule bonding is ionic
1 AnswerWords & Wordplay8 years agoThe %, by mass, of a solution containing 4.0 g of NaOH in 96.0 g of water is____?
The molarity (moles/L = M) of a solution of 4.0 g NaOH in a total volume of 100.0 mL (or 40 g in 1.0 L) is______
Report both answers to the maximum #significant figures allowed.
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a )NiCO3
b) BaSO4
c) NaCl
d) SiO2
Which one can be separated from the others using HCl?
1 AnswerEarth Sciences & Geology8 years agoConsider the following components which might appear in a mixture to be separated: CaCO3, CaSO4, Ca(NO3)2. W?
a) CaCO3
b) CaSO4
c) Ca(NO3)2
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a) You should always begin with cold water in the beaker
b) Secure the beaker with a ring clamped to a ring-stand
c) Rate of heating must be controlled to avoid splattering
d) Steam from a hot water bath can scald you
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having values of m1 = 0.0 g, V1 = 0.0 mL and m2 = 14.85 g, V = 5.5 mL? Include units, placing a space between the number and the units.
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Does HDMI really make a difference in the quality that i should get a new one.
BTW i have a Dynex 32" LCD HDTV
3 AnswersXbox1 decade ago