How to calculate atomic mass?

A student carefully placed 15.6 g of sodium in a reactor supplied with an excess quantity of chlorine gas. When the reaction was complete, the student obtained 39.7 g of sodium chloride. Calculate how many grams of chlorine gas reacted.

Has its own size and shape

What is the mass of an element with 78 protons and 78 neutrons

Suggest why do you think people believe some theories even if they are not supported by credible evidence?

Which polyatomic ion is found in the compound represented by the formula NaHCO3? (1) acetate (3) hydrogen sulfate (2) hydrogen carbonate (4) oxalate

What is the complete balanced equation for the reaction that occurs when lithium carbonate (Li2CO3) is heated?

Which statement best compares coastal ecosystems to open ocean ecosystems? Coastal ecosystems include abyssopelagic depths, and open ocean ecosystems do not.

If you are given a 1.0 L (1000mL) of an unknown liquid which has the mass of 500 grams it is most likely which of the above substances? Show work to back up your answer. Distilled water density 1.0 g/cm^3 propane density 0.

When 3.05 moles of ch4 are mixed with 5.03 moles of 02 the limiting reactant is?

How does hydrogen bonding affect water molecules