Is monosodium glutamate an element, compound, homogeneous mixture, or heterogeneous mixture?

The answer to your question is: Compound

Explanation:

Monosodium glutamate formula:

                                                         C₅H₈NO₄Na

Element  We can see in the formula, that monosodium glutamate is formed by many elements ( carbon, hydrogen, nytrogen oxygen and sodium), not only one, so it is not a compound.

Compound it is a compound because is formed by many elements.

Homogeneous mixture it is not an homogeneous mixture because in order to be this kind of mixture is necessary a have two or more compounds together in the same container, it does not happen here.

Heterogeneous mixture, it's the same as an homogeneous mixture, it is necessary to have two or more compounds in the same container.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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