Guys please answer i have no clue how to do this According to this balanced chemical equation,
what volume of C2H2 is required to form 40.0L
of CO2?

2C2H2(g) + 502(g) → 2H2O(g) + 4CO2(g)

A. 20.0L
B. 44.8L
C. 80.0L
D. 100 L

How many moles are in 1.26*10^24 particles in significant figures

Which order shows the levels of organization from largest to smallest? organism, organ system, cell, organ, tissue organism, tissue, organ system, organ, cell organism, organ, organ system, cell, tissue organism, organ system, organ, tissue, cell

Why is it important for scientists to review and repeat the work of other scientists? 1.a scientific theory must be tested three times before it is proven. 2.the scientific method only applies to repeated experiments. 3.an experiment may have had errors that the scientists didn't recognize. 4.the results of individual scientists may be influenced by bias. 5.an experiment must be performed twice before the data can be analyzed.