Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(NH4)2SO4. What mistake did Elena make?

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.