Which statement best describes a mole?

A student collected nitrogen by displacing water in a graduated cylinder. the atmospheric pressure was 738.9 mmhg; the height of the water remaining in the cylinder was 13.2 mm; the partial pressure of the water was 18.8 mmhg.

1. Calculate the heat change associated with cooling a 350.0 g aluminum bar from 70.0 degrees C to 25.0 degrees C. The specific heat capacity of aluminum is 0.9.

Calculate the wavelength of a body of mass 96.0 mg and moving with a velocity of 30.0 m/s. The value of Planck's constant is 6.626 * 10-34 J s.

Which of the following gases is monatomic at STP?

The combustion of ammonia in the presence of excess oxygenyields NO2 (g) and H2O (g) : 4NH3 (g) + 7O2 (g) → 4NO2 (g) + 6H2O (g) The combustion of 43.9 mg of ammonia produces how many grams ofNO2 (g) ? A. 178B. 0.119C. 43.9D. 0.954E. 2.58

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda