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Questions in chemistry

[Terjawab] What volume, in liters, of 4.0 M LiBr solution can be made using 100.0 g LiBr? [tex]LiBr : 86.44 g / mol[/tex]

[Terjawab] What is the molar mass of $H_3PO_4$? (Molar mass of $H = 1.0079 g/mol; P = 30.974 g/mol; O = 15.999 g/mol$) A. $72.98 g/mol$ B. $78.22 g/mol$ C. $88.24 g/mol$ D. $97.99 g/mol

[Terjawab] HFC-134a has replaced which of the following in all MVAC systems? A. HFC-777 B. CFC-12 C. HFC-143a D. HFC-123a

[Terjawab] What element is undergoing reduction (if any) in the following reaction? [tex]Zn(s)+2 AgNO_3(aq) \rightarrow Zn(NO_3)_2(aq)+2 Ag(s)[/tex] A. Zn B. Ag C. O D. N E. This is not an oxidation-reduction reaction.

[Terjawab] X and Y are oxides of elements of Period 3 of the Periodic Table. If one mole of X is added into water, the solution produced is neutralised by one mole of Y. Which oxides are represented by X and Y? X | Y ---|--- A | SO3 | Al2O3 B | P4O10 | Na2O C | SO3 | Na2O D | P4O10 | Al2O3

[Terjawab] Which pair shares the same empirical formula? A. [tex]$C _2 H _4$[/tex] and [tex]$C _6 H _6$[/tex] B. [tex]$CH _2$[/tex] and [tex]$CH _4$[/tex] C. [tex]$CH _3$[/tex] and [tex]$C _2 H _6$[/tex] D. CH and [tex]$C _2 H _4$[/tex]

[Terjawab] Select from the response list the compound or ion that best fits the description: conjugate base of [tex]$H _3 PO _4$[/tex]. [tex]$PO _4^{3-}$[/tex] [tex]$HPO _4{ }^{2-}$[/tex] [tex]$H _3 PO _4$[/tex] [tex]$H _2 PO _4^{-}$[/tex]

[Terjawab] Using the phase diagram for [tex]H _2 O[/tex], what phase is water in at 1 atm pressure and [tex]$-5^{\circ} C$[/tex]? A. It is at its melting point. B. It is in the gas phase. C. It is in the liquid phase. D. It is in the solid phase.

[Terjawab] Which of the following equations represents an acid-base neutralization reaction? [tex]$H _2 SO _4+ Zn \rightarrow ZnSO _4+ H _2$[/tex] [tex]$HNO _3+ KOH \rightarrow KNO _3+ H _2 O$[/tex] no correct response more than one correct response [tex]$Ba ( OH )_2+ Na _2 SO _4 \rightarrow BaSO _4+2 NaOH$[/tex]

[Terjawab] Which statement would be the most useful for deriving the ideal gas law? A. Volume is directly proportional to the number of moles. B. Volume is inversely proportional to the temperature. C. Pressure is directly proportional to the volume. D. Pressure is inversely proportional to the number of moles.