please answer all asap!! im confused

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please answer all asap!! im confused
12 concentration of 12.45 by man. What mass of solute is present in 500 g of the solution? U Xa x В 0 % с <> x

Ot35 with sufficient oxygen present, pentane burns according to the reaction: Not yet answered CyHx201) + 80%(9) -- SCO (9) + 6H20(9) Marked out of 2.00 What volume of oxygen at SATP is required to produce 48.0 L of CO2(9) at SATP? Mag Question Express your answer (in litres) to one decimal place. Do not include units! L Question 36 Match each definition with its term. Not yet answered The point during a titration at which the exact theoretical chemical amount of titrant has been askan ch

con Express your answer in tres) to one decimal place. Do not include units! 36 Not yet Match each definition with its term 100 The point during a bitration at which the exact theoretical chemical amount of titrant has been added to the sample A relatively flat region of a pH curve where a nearly constant pH is maintained. The point during a titration when there is a sudden change in some observable property of the solution, such as colour, pH, or conductivity. ✓ Choose... endpoint equivalence point buffer region Choose... . 37