1. A 25.00 mL sample of 0.20M H2CO3 was titrated with 0.50M NaOH. What volume of NaOH was required to reach the equivalence point? 2. A 10.00 mL sample of vinegar (CH3COOH) was titrated with 18.20 mL of 0.50M NaOH. Calculate the [CH3COOH].

3. In order to standardize a solution of NaOH, 0.18g of oxalic acid, H2C2O4∙2H2O, was dissolved to make 250.00 mL of a solution. A 25.00 mL sample of this solution was titrated against 15.25 mL NaOH. Calculate the [NaOH].

4. Aspirin has the formula C9H8O4. Only one of the H atoms is released when it acts as an acid. An aspirin tablet with a mass of 0.50 g was dissolved in water, and titrated with 18.30 mL of 0.10M NaOH. Calculate the mass of aspirin in the tablet, and then the percent by mass of aspirin in the tablet.

This large tectonic plate is bounded on three sides by whats know as the ring of fire. what is the name of this tectonic plate? a) pacific plate b) eurasian plate c) north american plate d) indo- australian plate plz it's science but there's no option for science so i picked chemistry

What is the temperature of one mole of helium gas at stp?

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.