20. What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to

the correct number of significant figures.

a. 128 cm2

b. 1280 cm?

1280.3 cm?

d. 1280.32 cm

128.0319 cm?

C.

e.

An increase or decrease in energy during a chemical reaction is called

What mass of ammonia, NH3, is necessary to react with 2.1 x 10^24 molecules of oxygen in the following reaction? 4NH3 (g) + 7O2 (g) - - > 6H2O (g) + 4NO2 (g)

How do you convert 642cg to kilograms

Including all coefficients, charges, and phases, what is the correct net ionic equation for the following set of reactants? Assume that the contribution of protons from H2SO4 is near 100%.

Consider the balanced chemical reaction below. When the reaction was carried out, the calculated theoretical yield for carbon dioxide was 93.7 grams, but the measured yield was 88.3 grams. What is the percent yield?

A blank is a special kind of mixture in which one substance is uniformly mixed into another

importance of pH value in daily life

How do metallic bonds differ from covalent and ionic bonds

Will ag2so4 precipitate when 100 ml of 5.0*10-2 m agno3 is mixed with 10 ml of 5.0*10-2mna2so4 solution?

How many grams of H₂ are produced with the reaction of 36 grams of water? 2 Na + 2 H20 - > 2 NaOH + h2