$\frac{\mathbf{1}\mathbf{.}\mathbf{5}\mathbf{}\mathbf{g}\mathbf{}\mathbf{C}}{\mathbf{2}\mathbf{.}\mathbf{00}\mathbf{}\mathbf{g}\mathbf{}\mathbf{O}}\mathbf{=}\frac{\mathbf{6}\mathbf{.}\mathbf{4}\mathbf{}\mathbf{g}\mathbf{}\mathbf{C}}{\mathbf{x}\mathbf{}\mathbf{O}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\frac{\overline{)(1.5)}\mathbf{x}}{\overline{)\mathbf{1}\mathbf{.}\mathbf{5}}}\mathbf{=}\frac{\mathbf{12}\mathbf{.}\mathbf{8}\mathbf{}\mathbf{g}}{\mathbf{1}\mathbf{.}\mathbf{5}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathbf{x}\mathbf{=}\frac{\mathbf{12}\mathbf{.}\mathbf{8}\mathbf{}\mathbf{g}}{\mathbf{1}\mathbf{.}\mathbf{5}}$

A sample of ascorbic acid (vitamin C) is synthesized in the laboratory. It contains 1.50 g of carbon and 2.00 g of oxygen. Another sample of ascorbic acid isolated from citrus fruits contains 6.40 g of carbon.

According to the law of constant composition, how many grams of oxygen does it contain?

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