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Determining the formula of a hydrate.

When all of the water of hydration was driven off of 4.32g of a hydrate of compound Z, the residue, the anhydrous form of Z, had a mass of 3.09g. What is the formula of the hydrate (using the symbol Z as part of it)? The formula mass of Z is 90.0

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

5229

OTA ID:

101534

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Calculating the empirical formula of a compound.

Determine the empirical formula of each compound from the following data. 1. Talc (used in talc powder) has mass composition 19.2% Mg, 29.6% Si,42.2% O, 9.0% H. n=m/mm

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

5288

OTA ID:

103139

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Specific heat - What is the mass of copper?

Copper has a specific heat of 0.382 J g-1 degrees Celsius -1. The temperature of an unknown mass of copper increases by 4.50 degrees Celsius when it absorbs 3.97 J of heat. What is the mass of copper?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

5315

OTA ID:

101374

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Calculating the final temperature of a substance undergoing a heat loss.

Commercial cold-packs consist of solid ammonium nitrate and water. Ammonium nitrate absorbs 330 J of heat per gram dissolved in water. In a coffee-cup calorimeter, 2.00 g of ammonium nitrate are dissolved in 75.0 g of water at 30 degrees Celsius. Assuming that all of the heat is lost from the water, what is the final temperature of the water? The specific heat of water is 4.18 J C-1 g-1.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

5316

OTA ID:

101353

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Calculating the heat capacity of a substance burned in a bomb calorimeter. Solution provides the specific calculation steps.

A 1.000-g sample of benzoic acid, C7H6O2, is burned in a bomb calorimeter. The temperature of the calorimeter increases by 7.53 degrees Celsius. What is the heat capacity of the calorimeter in units of kJ degrees Celsius -1? Please note that (3.09)(10^3)kJ of heat are liberated per mole of benzoic acid combusted.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

5317

OTA ID:

102922

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