Other Chemistry Answers

Which of these reactions is correct for nitrogen gas reacting with hydrogen gas to form gaseous ammonia?
a.... N2 (g) + 3H2 (g) → 2NH3 (s)
b.... N2 (g) + 3H2 (g) → 3H2 (g) + 2NH3 (s)
c.... 2NH3 (g) → N2 (g) + 3H2 (g)
d.... N2 (g) + 3H2 (g) → 2NH3 (g)
.

In the reaction, Cu (s) + 2Ag(NO3) (aq) → 2Ag (s) + Cu(NO3)2 (aq), which of the reactants or products are dissolved in water?
a.... Cu
b.... Ag(NO3)
c.... Ag
d ... Cu(NO3)2

In the reaction, 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g), which of the reactants or products is in the gas phase?
a.... Na
b.... H2O
c.... NaOH
d.... H2
.

In the reaction, HCl (aq) + NaHCO3 (aq) → NaCl (aq) + H2O (l) + CO2 (g), which of these is a reactant?

a.... NaHCO3
b....NaCl
c....H2O
d....CO2

multiple choice:

Chemical equations provide:
a....the physical state of each reactant and product
b....the ratios of reactants and products
c....the chemical identity of the reactants and products
d....All of these are correct.

define fllowing inyour words solute solvent reatedent product?

hello teacher,iwant to know from you that "what are the attractive forces between the molecule of hf and hcl"please reply me now

250 ml aq. solution H2O2 produces just sufficient amount of 0.2 at STP which burns 25g impure sample of calcium having 60 percent purity. Calculate volume strength of H2O2 solution.

what are the attractive forces between the molecules of hf and hcl

1. Calculate the standard enthalpy change for the reaction:
C2H4(g) + H2(g)→C2H6(g)
given that the enthalpy of combustion
for the reactants and products are:
∆Hºc(C2H4)(g) = -1411 kJ mol^-1∆Hºc(C2H6)(g) = -1560 kJ mol^-1∆Hºc(H2)(g) = -286 kJ mol-1.

2. Calculate the enthalpy change of
combustion for ethene gas (C2H4) given the
following enthalpy changes of formation:
∆Hºf(C2H4)(g) = +52 kJ mol^-1∆Hºf(CO2)(g) = -394 kJ mol^-1
∆Hºf(H2O)(g) = -286 kJ mol^-1

3.Calculate the standard entr
opy change for the reaction:
N2+ 3H2→2NH3
given the standard entropies
Sº(N2)(g) = 191.6 J K^-1 mol^-1
Sº(H2)(g) = 130.6 J K^-1 mol^-1
Sº(NH3)(g) = 193.3 J K^-1 mol^-1