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4 years ago

What is enthalpy?

Chemistry

1 answer:

aleksandrvk [35]4 years ago

7 0

Answer: the heat content of a system at constant pressure.

Explanation:

Enthalpy is defined as the heat content of a system at constant pressure.

It is the heat absorbed or released during a reaction at constant pressure,denoted as ΔH.

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Acid rain is composed mainly of the oxides of two elements. give either.

Nutka1998 [239]

<span>The two elements that are responsible for acid rain are sulphur and nitrogen.</span>

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4 years ago

Suppose 15.00 mL of 3.0 x 10^{-6} M Fe(NO3)3 is added to 15.00 mL of 3.0 x 10^ –4 M KIO3. Will a precipitate form? Explain why.

matrenka [14]

It is 30292
$2 \times 2 \sqrt[ > ]{?}$

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3 years ago

A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student pre

gladu [14]

Answer:

Explanation:

2.60 g of CoCl2 was dissolved in water to make 100 mL of solution.

Number of moles of CoCl2 dissolved = mass/molar mass

= 2.60/130

= 0.02 mole

Molar concentration of solutions = number of moles/volume (dm3)

= 0.02/0.1

= 0.200 M

Hence, the molar concentration of thesolution is 0.200 molar.

Correct option = A

3 0

3 years ago

A chemist must calculate the amount of an element needed for a chemical reaction. The reaction requires 3.4 moles of silver. Hel

zvonat [6]

Answer:

3.4 moles of silver * 107.868 grams of silver/1 mole of silver = 370 grams of silver.

Explanation:

According to the NYS Reference Table, one mole of silver equates to 107.868 grams. Therefore, if you want to convert from moles to grams, the mole unit should be on the bottom, since it is the unit being cancelled out. Above the mole unit should be the gram unit, since it is the unit you want to convert to. Once you do the math with significant figures, the solution turns out to be 370 grams of silver.

6 0

3 years ago

You are given a 2.9237 g sample of a substance with the generic formula MCl2(H2O)6. After completely drying the sample (which me

Katyanochek1 [597]

Answer:

M is cobalt (Co)

Explanation:

Step 1: Data given

Mass of MCl2(H2O)6 = 2.9237 grams

After completely drying the sample (which means removing the 6 moles of H2O per mole of MCl2), the sample weighs 1.5941 g.

Step 2: Calculate mass of water

Mass of water = 2.9237 - 1.5941 = 1.3296 grams

Step 3: Calculate moles water

Moles water = mass water / molar mass water

Moles water = 1.3296 grams / 18.02 g/mol

Moles water = 0.07378 moles

Step 4: Calculate moles of the whole substance

For 1 mol MCl2(H2O)6 we have 6 moles H2O

Number of moles of the whole substance = 0.07378 / 6 = 0.01230 moles

Step 5: Calculate molar weight of the substance

Molar weight = mass / moles

Molar weight = 1.5941 grams / 0.01230 moles

Molar weight = 129.6 g/mol

Step 6: Calculate molar weight of M

Molecular weight of M = 129.6 - (2*35.45)

Molecular weight of M = 58.7 g/mol

M is cobalt (Co)

4 0

3 years ago