Question

1. if the mass percent of oxygen in Na₂Cr₂O₇ is 42.8%, what is the mass of oxygen atoms in grams in 11 grams of Na₂Cr₂O₇?

2. When magnesium metal (Mg) reacts with hydrochloric acid (HCl), magnesium chloride (MgCl₂) and hydrogen gas (H₂) are produced according to the following chemical equation.

2 HCl (aq) + Mg (s) → MgCl₂ (aq) + H₂ (g)

If 1.87 moles of HCl is consumed in the chemical reaction above, how many grams of HCl are consumed? Molar mass of HCl is 36.46 g/mol.

*please explain

Answer 1

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