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Chemistry
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help please!!?
6 days agoScience help please?
Suppose that a flask has some vinegar in it and a balloon has some baking soda in it. Next, the balloon is fit over the flask and the baking soda is dumped in. There is fizzing and the balloon fills as gas is produced. The balloon keeps any gas from escaping. If the initial mass of all parts combined is found to be 100g, what should the mass be of all parts after the reaction is complete?
A. 101
B.98
C. 100
D. 99
1 Answer6 days agoBest wishes, all.?
Sorry to see this disappear. But cheers to all of you. I hope to bump into you all again sometime.
2 Answers6 days agoIf 0.125 mol of nitrogen gas and 0.125 mol of oxygen gas react, what is the limiting reactant and how many moles of NO are produced?
Please help me..
If 0.125 mol of nitrogen gas and 0.125 mol of oxygen gas react, what is the limiting reactant and how many moles of NO are produced
N2(g)+O2(g)→2 NO(g)
1 Answer6 days ago14kgs is gold shielding, a very thick plating of gold is put on a base metal. ?
14kgs is gold shielding, a very thick plating of gold is put on a base metal. If it has 14kp not go or hp, 14kp means 14k plumb, meaning it's the lowest 14k, but 14kp usually tests to be 15 and 16 karat. The P guarantees the quality of the gold
1 Answer6 days agoCalculating Enthalpy Change?
In a coffee cup calorimeter, 104.0 mL of 1.9 M NaOH and 104.0 mL of 1.9 M HCl are mixed. Both solutions were originally at 22.3°C. After the reaction, the final temperature is 35.0°C. Assuming that all the solutions have a density of 1.0 g/cm3 and a specific heat capacity of 4.18 J·°C−1·g−1,
calculate the enthalpy change (in kJ/mol) for the neutralization of HCl by NaOH. Assume that no heat is lost to the surroundings or to the calorimeter.
1 Answer6 days agoI need help pleaseeeeee!?
Given the information
A+BC⟶2D⟶DΔ𝐻∘Δ𝐻∘=−626.3 kJΔ𝑆∘=364.0 J/K=465.0 kJΔ𝑆∘=−134.0 J/K
calculate Δ𝐺∘ at 298 K for the reaction
A+B⟶2C
6 days agoHEEEELLLLPPPPP!!!!!!?
For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species.
For the reaction
C2H6(g)+H2(g)↽−−⇀2CH4(g)
the standard change in Gibbs free energy is Δ𝐺°=−69.0 kJ/mol . What is ΔG for this reaction at 298 K when the partial pressures are 𝑃C2H6=0.350 atm , 𝑃H2=0.250 atm , and 𝑃CH4=0.800 atm ?
1 Answer6 days agoPlease help me!?
For a particular reaction at 231.2 °C, Δ𝐺=233.53 kJ , and Δ𝑆=117.18 J/K .
Calculate Δ𝐺 for this reaction at −53.0 °C.
6 days agoWich process is endothermic?
1 Answer6 days agoA 1500.0 gram piece of wood with a specific heat capacity of 1.8 g/JxC absorbs 67,500 Joules of heat.?
If the final temperature of the wood is 57C, what is the initial temperature of the wood? (2 sig figs)
so i put the picture and the question because people didn't believe me when i said the answer wasn't 82. Thank you guys for trying though.
1 Answer6 days agoURGENT AP CHEM BUFFER QUESTION!!!?
A chemist needs to prepare a buffer solution of pH 8.80. What molarity of NH3 (pKb = 4.75) is required to produce the buffer solution if the (NH4)2SO4 in the solution is 1.8 M?
i believe that i'd use pH = pKb + log(B+/BOH) but i don't know how to utilize it.
7 days agoI need help with this Chemistry Question?
Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,ℓ,mℓ,ms).
Are these correct?
1 Answer7 days ago