Chemistry, 29.01.2021 23:20 pstrezze1840
Which of the following describes the law of conservation of mass?
A.) Reactants + Products = 100%
B.) Matter (mass) cannot be created or destroyed in ordinary chemical and physical changes, but it can change form
C.) Mass of products does not equal mass of reactants
D.) Matter (mass) can be created or destroyed in certain chemical reactions
Answers: 1
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Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)
Answers: 1
Which of the following describes the law of conservation of mass?
A.) Reactants + Products = 100%
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