Atoms can gain, lose, or share
electrons during a chemical change. Why
doesn't this cause the...
Answers: 2
Chemistry, 20.06.2019 18:04
According to the balanced chemical equation 5 h2c2o4(aq) + 2 mno4-(aq) + 6 h+(aq) → 10 co2(g) + 2 mn2+(aq) + 8 h2o(l) 0.875 grams of oxalic acid, h2c2o4 will react with moles of permanganate, mno4-.
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Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 20:00
What is the molar mass of the anhydrous compound? answer using four significant figures. 36.02 g/mol 120.15 g/mol 156.12 g/mol
Answers: 1
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