The electron has a mass of 1/1840 of a proton or neutron. Protons and neutrons have the same mass.
Answer:
Choice A.
A low birth to death ratio
Explanation:
A low birth to death ratio means that people are dying faster than they are being born. This leads to a decreasing population size.
Freshwater on the land surface is a vital part of the water cycle for everyday human life. On the landscape, freshwater is stored in rivers, lakes, reservoirs, and creeks and streams. Most of the water people use everyday comes from these sources of water on the land surface.
The volume = 309.04 ml
<h3>Further explanation</h3>
Given
Specific gravity=-1.28 and strength =24.7% by mass of H₂SO₄
mass 125g of ZnC0₃
Required
The volume of H₂SO₄ Solution
Solution
Reaction
ZnCO₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O
mol of ZnCO₃(MW=125.4 g/mol) :
From equation, mol ZnCO₃ : H₂SO₄= 1 : 1 so mol H₂SO₄=0.997
mass of H₂SO₄ (MW=98 g/mol) :
mass of solution :
Volume of solution :(density of solution=1.28 g/ml for the reference substance is water(density=1 g/ml)