Can someone help me to answer this correctly, please, and explain it. Please answer these 3 short questions, I don't have more money to buy more questions. These 3 questions are different.

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In the Iaboratory, a student dilutes 22.0mL of a 6.22M perchloric acid solution to a total volume of 150.0mL What is the concentration of the diluted solution? Concentration = M How many milliliters of 7.83M hydrobromic acid solution should be used to prepare 5.00L of 0.200MHBr ? mL In the laboratory, a student adds 50.7mL of water to 29.1mL of a 0.699M nitric acid solution. What is the concentration of the diluted solution? Assume the volumes are additive. Concentration = M