Answer:

Introduction:
In NMR spectroscopy, the number of signals or peaks reflects the number of chemically different hydrogen atoms in a molecule. N, N-dimethylformamide (DMF) is an organic compound with the molecular formula C3H7NO. It is a polar solvent commonly used in organic synthesis and industrial applications.

Number of peaks in 1H NMR of DMF at 25°C:

1. Chemical structure of DMF:
To determine the number of peaks in 1H NMR of DMF, we need to analyze its chemical structure. DMF contains three chemically different hydrogen atoms, which are attached to the carbon and nitrogen atoms in the molecule.

2. Chemical shifts of hydrogen atoms:
The chemical shifts of the hydrogen atoms in DMF depend on their chemical environment, which is influenced by the neighboring atoms and functional groups. The hydrogen atom attached to the nitrogen atom (NH) has a chemical shift of around 8-9 ppm, while the two hydrogen atoms attached to the carbon atoms (CH3) have chemical shifts of around 2-3 ppm.

3. Splitting of signals:
The number of peaks in 1H NMR of DMF can also be affected by the splitting of signals due to the spin-spin coupling between the neighboring hydrogen atoms. However, in DMF, there is no spin-spin coupling between the NH and CH3 hydrogen atoms, as they are separated by a nitrogen atom.

Conclusion:
Based on the chemical structure and chemical shifts of the hydrogen atoms in DMF, we can predict that there will be three signals or peaks in its 1H NMR spectrum at 25°C. The NH hydrogen atom will appear as a singlet at around 8-9 ppm, while the two CH3 hydrogen atoms will appear as a triplet at around 2-3 ppm.