One million atoms of a particular element have a mass of 1.99 x 10 ^-17 grams.
- how many moles of this element are there?
- what is the molar mass of this element?
- what is the identity of this element?

Moles of this element = moles

The molar mass of this element  is 12 g/mol.

Carbon is the identity of this element.

Explanation:

Number of atom = 1,000,000

Number of atoms =

Moles of this element = moles

If moles weighs =  

Then mass of 1 mol =

The molar mass of this element  is 12 g/mol.

Carbon is the identity of this element.

The IR spectrum of butyric acid should have a broad signal between 2500 cm⁻¹ and 3600 cm⁻¹. An IR spectrum of ethyl acetate will not have this signal.

Explanation:

IR spectroscopy is a widely used technique in chemical identifications. In a IR spectrum, signals depend of nature of bonds in the chemical structure of the compound.

Ethyl acetate is an esther. Its principal signal is between 16500cm⁻¹ and 1850cm⁻¹ (Carboxylic compound).

Butyric acid is a carboxylic acid. Carboxylic acids have 2 principal signals: The first is between 16500cm⁻¹ and 1850cm⁻¹ (Carboxylic compound) and the second is between 2500cm⁻¹ and 3600cm⁻¹ (Due the hydrogen bonding between O-H atoms).

Thus, right answer is:

The IR spectrum of butyric acid should have a broad signal between 2500 cm⁻¹ and 3600 cm⁻¹. An IR spectrum of ethyl acetate will not have this signal.