Using the equation

2H2+O2-->2H2O

If 19 g of oxygen reacts completely, how many grams of hydrogen must react with it?

Question options:

4.8

3.6

1.2

2.4

Determine the mass of a billion gold (u) atoms

How is heat produced in a chemical change

People who stand in the moons umbra, the darkest part of its shadow, experience what? A - partial lunar eclipse B - partial solar eclipse C - a total solar eclipse D - a total lunar eclipse

If 15.0 g CO2 (mm = 44.01 g/mol) has a volume of 0.30L at 27oC, what is the pressure in atm? Group of answer choices 27.97 atm 1230.9 atm 2.52 atm 325.0 atm

Which of these elements is a metal? hafnium (Hf) radon (Rn) silicon (Si) sulfur (S) selenium (Se)

Which fossil fuel is the most widely consumed in the United States? A. petroleum B. natural gas C. peat D. coal

Why is the use of natural gas as a full becoming more common

A swimming-pool worker wants the pool's pH to be 7.2. She comes by to test the water and finds that the pH is 9.2. What should she do to correct this situation? A. Add water. B. Add base. C. Add acid. D. Do nothing.

What type of rock is sandstone

According to the Br? nsted-Lowry theory, water A. acts as a base when it accepts a hydrogen ion. B. can be neither an acid nor a base. C. can act as an acid by accepting hydrogen ions. D. can accept but not donate hydrogen ions.