1. The main component of monosodium glutamate is sodium glutamate, and its chemical formula is HOOCCHNH2(CH2) 2COONa. Sodium glutamate consists of (5) elements with a relative molecular weight of (169).

Firstly, the chemical formulas are combined to obtain C5H8NO4Na, which contains five elements: C, H, N, O and Na.

The relative molecular weight is12 * 5+1* 8+14+16 * 4+23 =169.

2. It is known that the molecular formula of K2MnO4 is m. If the relative atomic mass of potassium is a and that of oxygen is b, the relative atomic mass of manganese (expression) is x=m-2a-4b.

The molecular weight is the relative molecular mass. Let the relative atomic mass of Mn be x.

The molecular formula of K2MnO4 is m=2a+x+4b, and x=m-2a-4b.