How many moles of Na2CO3 are there in 15.0 L of 5.30 M solution? * 2.83 mol
79.5 mol
0.08 mol
0.35 mol

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost