Answer:
7,38 g of K₃PO₄
Explanation:
Molarity is an unit of chemical concentration. 0,139 M means 0,139 moles of solute per liter of solution.
In this case, the solute is potassium phosphate (K₃PO₄; molar mass: 212,27 g/mol) and the volume of the solution must be 250mL≡0,25L.
Thus, the moles of potassium phosphate you need are:
0,139 mol/L×0,25L = 0,03475 moles of K₃PO₄
In grams:
0,03475 moles of K₃PO₄ × 
= 7,38 g of K₃PO₄
I hope it helps!
Answer:a reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel by oxidation, especially in the presence of moisture.
Explanation: so basically rusting happens when a metal comes in contact with moisture and air, at a brown, dirty metal coat forms on it.
1eV --------- is ----------- 1.6*10⁻¹⁹J
1.931eV ---- is ----------- x
x = [1.931eV*1.6*10⁻¹⁹J]/1eV ≈ 3,1*10⁻¹⁹J
<u>ANSWER E</u>
Answer: stay away from doors and windows.
Explanation:
to aviod geting hit by glass
