(multiple choice!!)
A balloon filled with helium gas at 15.0oC occupies 1.5 L at 760 mmHg. The balloon is immersed in liquid nitrogen at 77 K, changing the volume to 3.00 L. What is the new pressure of the balloon in mmHg?

0.039 mmHg

1950 mmHg

101.6 mmHg

0.0098 mmHg

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Select the correct answer. when carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: co2 + h2o → h2co3. if 495 milliliters of carbon dioxide at 25°c and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? use the periodic table and the ideal gas resource a. 0.889 g b. 1.10g c. 1.27g d. 2.02g what's the answer! quick!