What is the mole to mole relationship between the copper

Question

What is the mole to mole relationship between the copper and silver respectively?

A. 2:10

B. 2:1

C. 1:1

D. 1:2

E. 8:3

 

How many moles of NH4Cl are in 5g of NH4Cl? The MW=53.492). To calculate the number of moles divide the grams by the molecular weight.

A. 534 mol NH₄Cl

B. 5 mol NH₄Cl

C. 0.093 mol NH₄Cl

D. 10.698 mol NH₄Cl

E. 20 mol H₂0

 

What was the initial heat energy before mixing the cold and hot water? To calculate this you need to use the formula : Q_initial= m1CpT(of the hot water) + m2CpT(of the cold water) where Q is the heat energy, m is the mass , Cp is the specific heat of water 4.18 J/g^oC, and T is the temperature. Choose the closest answer.

A. 7J

B. 218 J

C. 1056 J

D. 9,459 J

E. 17,034 J

 

The molecular weight of propane is 44.10 g/mol.Based on the number of grams of gas measured, how many moles is this? = mass / molecular weight) Choose the closest answer.

A. 6.2 x 10^-3 mole

B. 5.2  x 10^-3 mole

C. 4.1 x  10^-3 mole

D. 1.28 x10^-11 mole

E. 9.8 x 10^-2 mole

 

In a real gas (non-ideal), the molecules can interact with each other. Suppose that the primary interaction between the molecules is attractive.How would this affect the results?

A. There would be no difference.

B. Moving backward and forward simultanously

C. The pressure becomes independent of the identity of the molecules.

D. The pressure would be lower for a more strongly attracting gas.

E. The pressure would be higher for a more strongly attracting gas.

 

Which of the following represents the balanced equation for the reaction?

A. Cu₂CO₃(OH)₂*H₂O -> 2CuO +2H₂O

B. Cu₂CO₃(OH)₂*H₂O -> 2CuO

C. Cu₂CO₃(OH)₂*H₂O

D. Cu₂CO₃(OH)₂*H₂O -> 2CuO +2H₂O + CO₂

_{E. Cu2CO3(OH)2*H2O -> CuO +H2O + CO2}

 

What is the correct sign (+ or -) to place in front of the dH, molar enthalpy, for the reaction between HCl and NH3?

A. +d H = - 0

B. + dH because the reaction absorbed heat from the surroundings

C. + dH because the reaction released heat into the surroundings

D. - dH because the reaction released heat into the surrounding

E.  - dH because the reaction absorbed heat from the surroundings