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3 years ago

According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 488 kJ of energy?

Chemistry

1 answer:

vladimir1956 [14]3 years ago

7 0

Answer:

m = 95.47 g

Explanation:

The reaction is missing. I found it, and here's the missing part:

SiO2(s) + 4HF(s) -> SiF4(s) + 2H2O(l) ΔH°rxn = -184 kJ

According to the reaction, 2 moles of water are produced in this reaction, and this also produces 488 kJ of energy.

To calculate the mass of any compound we use the expression:

m = n*MM

The molar mass of water is 18 g/mol. so, we need the moles of water to get the mass. The relation between the heat and energy is the following:

ΔH = Q/n ---> solving for n:

n = Q/ΔH.

So, let's calculate moles of water used here:

n = 488 * 2/184

n = 5.304 moles

Now we can calculate the mass:

m = 5.304 * 18

m = 95.47 g

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A 0.1873 g sample of a pure, solid acid, H2X (a diprotic acid) was dissolved in water and titrated with 0.1052 M NaOH solution.

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Answer:

We need 41.8 mL of NaOH

Explanation:

Step 1: Data given

Mass of H2X = 0.1873 grams

Molarity of NaOH solution = 0.1052 M

Molar mass of H2X = 85.00 g/mol

Step 2: The balanced equation

H2X (aq) +2 NaOH (aq) → Na2X (aq) + 2H2O(l)

Step 3: Calculate moles of H2X

Moles H2X = mass H2X / Molar mass H2X

Moles H2X = 0.1873 grams / 85.00 g/mol

Moles H2X = 0.0022 moles

Step 4: Calculate moles of NaOH

For 1 mol H2X we need 2 moles NaOH to produce 1 mole of Na2X and 2 moles of H2O

For 0.0022 moles of H2X we need 0.0044 moles of NaOH

Step 5: Calculate volume of NaOH

Volume of NaOH = moles of NaOH / molarity of NaOH

Volume of NaOH = 0.0044 moles / 0.1052 M

Volume NaOH = 0.0418 L = 41.8 mL

We need 41.8 mL of NaOH

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1 year ago

One method for preparing pure iron from Fe2O3 is by reaction with carbon monoxide.Fe2O3(s)+CO(g)→Fe(s)+CO2(g) How many moles of

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Answer:

The 2292 moles of CO are needed to react completely with 122 Kg of Fe₂O₃.

Explanation:

Given data:

Mass of Fe₂O₃ = 122 Kg ( 122×1000 = 122000 g)

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Solution:

Chemical equation:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Number of moles of Fe₂O₃:

Number of moles = mass/ molar mass

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Now we will compare the moles of Fe₂O₃ with CO.

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