How many grams do 4.8 x 1026 atoms of silicon

weigh?

Answer in units of g.

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution for complete neutralization. What is molarity (M) of the H2SO4 solution

A three level system has energies ε0=0.00J, ε1=5.00x10-21J, and ε2=10.0x10-21J. a. Using the Boltzmann Distribution Law, calcuate the molar internal energy U at T=10.0K.

1. How many moles of AgNO3 are in 15.0 g?

Calculate the molarity of na + ions in 135 ml of a solution containing 5.32 g nacl and 1.20 g na2so4.

What type of change (physical or chemical) occurs when hydrogen bonds with oxygen to make water

How many protons are in chromium-58?

Which statement about the effusion rates of nitrogen and oxygen is true? Oxygen effuses 1.07 times faster than nitrogen. Nitrogen effuses 1.07 times faster than oxygen. Oxygen effuses 0.9 times faster than nitrogen. Nitrogen effuses 0.

Which of the following statements is true? A) Entropy is not a state function. B) Endothermic processes decrease the entropy of the surroundings, at constant T and P. C) Endothermic processes are never spontaneous.

Which of the following describes a chemical reaction? A. Molecules mix without interacting. B. Atoms in substances react with each other. C. Substances change shape but not properties. D. Molecules interact without bonds breaking.

How do we know stars are element factories?