Chemistry Answers

What is the concentration of the original solution if 450 mL, a certain solution is diluted in 750 mL water to form 2.0 L of 1.50 M HCl?

One mole nitrogen oxide, NO reacts with oxygen gas to produce a brown gas,NO2.

a. Write the thermochemical equation.

b. Is the reaction exothermic or endothermic. Show your solution

Considered the reaction:

3 NaOH(aq)+ FeCI3(s) →3 NaCI (aq) + Fe(OH)3 (s)

(molar mass: Fe(OH)3=106.84 g/mole; FeCI3=162.19 g/mol

1) if 300 ml of 0.150 M NaOH were added to a solution containing excess FeCI3, CALCULATE the mass of Fe(OH)3 would be produced

Who dissolve faster copper sulfate crystals + water at room temperature or copper sulfate powder + water at room temperature?

    If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900 K, what will be the volume of the gas if I decrease the pressure to 45 psi and decrease the temperature to 750 K?

I have an unknown volume of gas at a pressure of 50.50 KPa and a temperature of 325 K.  If I raise the pressure to 1.2 atm, decrease the temperature to 320 K, and measure the final volume to be 48 liters, what was the initial volume of the gas?

how many grams of Cu would have to react to produce 89.5 grams of Ag?

question 1

I have a solution of 0.0670 mol of Cu(NO3)2 in 154 mL of water. I then dissolve 0.45 mol of potassium cyanide, KCN, in this solution, and it instantly turns from a pale blue colour to a pronounced dark blue, indicating the formation of the tetracyanocuprate (ll) ion, [Cu (CN)4]2- . The volume of the final solution is 155 mL. Please calculate the concentration of free (uncoordinated) Cu2+ in this solution. Show all your work, including the minor conversions and the ICE table. Write a balanced equation to begin.

Question 1

a) What is the concentration of Ca2+ in a saturated solution of CaF2 in pure water, given that Ksp = 4.0 x10^-11?

Write the chemical equation for this reaction.

b) What is the concentration of Ca2+ in a saturated solution of CaF2 in 0.361 M NaF?

Write the chemical equation. SHow your use of the ICE table.

c) Without doing any calculations, would you expect the solution to be in part b) to be more acidic, basic, or neutral? Explain why it would be acidic, basic, or neutral by writing the chemical equation.

Consider the chemical reaction 2NH₃(g) ⇌ N₂(g) + 3H₂(g). The equilibrium is to be established in a 1.0 L container at 1,000 K, where K_c = 4.0 × 10^–2. Initially, 1,220 moles of NH₃(g) are present. Estimate the equilibrium concentration of N₂(g).