magnesium is a valuble metal used in alloys, in battries, and thr manufacture of chemicals. it is obtained mostly from seawaterwhich contains about 1.3 grams of Mg for every kilogram of seawater. calculate the volume of seawater in liters needed to extract 8.0 x 104 tons of Mg

Can someone me with 3 and 4 plz. this is for masteries test.

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.

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll