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Can someone help me to answer this correctly, please, and explain it. Please answer these 2 short questions, I don't have more money to buy

Can someone help me to answer this correctly, please, and explain it. Please answer these 2 short questions, I don't have more money to buy more questions. These 2 questions are different.

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Calculate the percentage composition for C3H8O3. (Enter your answer to four significant figures.) element \% by weight c H 0 Calculate the mass percentage of carbon in a mixture that contains 179 grams of sodium carbonate (Na2CO3) and 202 grams of citric acid (C6H8O7). Mass percentage C= %

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