- Calculate the mass of water produced when 1.42 g of butane reacts with excess oxygen?

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Does anyone know how to run descriptive statstics by group for the dependent variable and covariate in an ANCOVA in R? What is the conjugate acid of H2PO4-? Can the acceleration of a baseball be negative? Help with analyzing functions defined by definite integrals? Why is the first ionization energy of oxygen lower than that of N?