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Which of these is the symbol for tin?

Which of these is the empirical formula for N2O4?

A negatively charged atom or group of atoms is called __  ___________; a positively charged atom or group of atoms is called __ ___________.  

Which of these is the symbol for tin?

Which symbol below stands for potassium?

Add  these measured values and give the correct sum: 3.201 + 0.0325  + 10.0400 = ?

What is the best description of this group?          Cu, H2O, NaCl, I2  

What is the mass of 0.432 moles of C8H9O4? Consider one mole and go from there.

What is the percentage of composition of HClO3? HINT: Consider one mole in grams.

Add  these measured values and give the correct sum: 3.201 + 0.0325  + 10.0400 = ?