Chemistry Answers

In 100 mL of 6.02 M HCl, which has a gravity of 1.10 g/ml, a strip of magnesium metal with a mass of 1.22 g dissolves. The initial temperature of the hydrochloric acid is 23.0 °C, and the end temperature of the solution is 45.5 °C. Calculate AH for the reaction under the conditions of the experiment. (The heat capacity of the calorimeter is 562 J/°C, specific heat of the finals is 4.184 /gºC.) the reaction is: Mg(s) + HCl(aq) → MgCl2(aq) + H2(g)

The density of a crystal depends on what

If 4.0 moles of C3H8 will react with sufficient oxygen gas in the reaction,

C3H8 (g) + 5O2 (g) → 3CO2 + 4H2O(l),

how many moles of CO2 shall be formed?

what difference would the chemist observe at the negative electrode if aqueous zinc chloride was used rather than molten zinc chloride? answer

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The titration of a 10.0ml sample of vinegar requires 30.0ml of 0.20 M NaOH solution. Calculate

i. The molarity

ii. The mass /mass percent concentration of acetic acid.

Given that the density of acetic acid is 1.01g/cm3

1. Find the pH of the following solutions. Make sure you express your answer in the correct

number of significant digits. (12 marks)

a) 0.0010 M HClO₄ …..__________ b) 2.35 x 10^-3 M KOH …___________

c) 4.678 x 10^-5 M HNO₃..____­_____ d) 12.0 M HCl ...............…__________

e) 0.20 M Ba(OH)₂ .....___________ f) 4.30 M H₃O⁺ ...........…...__________

2. Find the [H₃O⁺] in 0.00256 M HBr. (1 mark)

Answer ________________

3. Find the [H₃O⁺] in 0.80 M LiOH. (2 marks)

Answer ________________

4. Find the [H₃O⁺] in a solution with a pH = 3.216 (1 mark)

Answer ________________

5. Find the [H₃O⁺] in 0.45 M BaO (2 marks)

Answer ________________

6. Find the [OH^-] in 0.150 M HClO₄ (2 marks)

20

Answer ________________

A sample of O2(g) which is saturated with water vapor, is kept in a 15.0-L vessel at 33°C and has a pressure of 750 torr. if the pressure of the water vapor at this temperature is 30.0 Torr, what would be the pressure of the dry oxygen?

in a gas mixture composed of N2, Ne, and He, the partial pressure of N2 is 0.60 atm, Ne is 1.5 atm, and He is 0.90 atm. What is the total pressure of the mixture?.Calculate the mole fraction of each gas

Calculate the percentage of Oxygen in Vitamin C