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frozen [14]
3 years ago
8

For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)?You do not need to look up any values to answer t

his question. Check all that apply. View Available Hint(s) Check all that apply. CO(g)+12O2(g)→CO2(g) Li(s)+12F2(l)→LiF(s) C(s)+O2(g)→CO2(g) CaCO3(g)→CaO+CO2(g) 2Li(s)+F2(g)→2LiF(s) Li(s)+12F2(g)→LiF(
Chemistry
1 answer:
Nutka1998 [239]3 years ago
3 0

Answer:

Reactions 1, 3 and 5

Explanation:

First thing's first, let's ensure that all the reactions given are balanced. This is given as;

CO(g) + 1/2 O2(g )→ CO2(g)

Li(s) + 1/2 F2(l) → LiF(s)

C(s) + O2(g) → CO2(g)

CaCO3(g) → CaO + CO2(g)

2Li(s) + F2(g) → 2LiF(s)

For the condition to be valid;

- There is by convention 1 mol of product made. This means we eliminate reactions with more than one mole of compound formed. This eliminates reaction 5.

- The lements haveto be in their state at room temperature. Fluorine is a gas, not a liquid, at room temperature ans pressure, so 2 is not a correct answer.

This leaves us with reactions 1, 3 and 5 as the correct reactions that satisify the condition.

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A 44% wt/wt solution of H2SO4 has a density of 1.343g/ml. What mass of H2SO4 is 60ml of this solution?
horsena [70]

<u>Answer:</u> The mass of sulfuric acid present in 60 mL of solution is 34.1 grams

<u>Explanation:</u>

We are given:

44 % (m/m) solution of sulfuric acid. This means that 44 grams of sulfuric acid is present in 100 grams of solution.

To calculate volume of a substance, we use the equation:

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

Density of solution = 1.343 g/mL

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Putting values in above equation, we get:

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To calculate the mass of sulfuric acid present in 60 mL of solution, we use unitary method:

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Hence, the mass of sulfuric acid present in 60 mL of solution is 34.1 grams

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3 years ago
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