CAN SOMEONE PLEASE EXPLAIN
At 475 mm Hg, a sample of nitrogen gas occupies 530 mL. What volume does the gas occupy if the temperature remains constant and the pressure increases to 755.5 mm Hg?

Select one:
a. 333
b. 677
c. 0.00593
d. 866

Pbco3 –> pbo+ co2. how many liters of carbon dioxide gas is produced from the decomposition of 32 grams of lead (ll) carbonate?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent