Hydrogen (H) was first, followed by helium (He).
B. increasing the amount of solvent used
Explanation:
The dimensions of a standard backpack is 30cm x 30cm x 40cm
The mass of an average student is 70 kg
We know that, the density of gold is 19.3 g/cm³.
Let m be the mass of the backpack. So,
An average student has a mass of 70 kg. If we compare the mass of student and mass of backpack, we find that the backpack is 10 times of the mass of the student.
Answer: PO43
Explanation: The structure and formula are as follows: The chemical structure of phosphate is PO43-.
The molecular mass is 94.97 g/mol.