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According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

How do you lengthen a pattern piece? (family and consumer science, sewing)

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?