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Chemistry Element Questions

1. What is the volume of 1.20 x 1022 molecules of nitric oxide gas, NO, at STP?

2. What is the mass of sodium phosphate (163.94 g/mol) that yields 1.00 g of calcium phosphate (310.18 g/mol) precipitate?
__CaCl2(s) + __Na3PO4(aq) → __Ca3(PO4)2(s) + __NaCl(aq)

3. How many moles of calcium metal react to yield 0.500 ml of of hydrogen gas? __Ca(s) + __H2O(ml) → Ca(OH)2(aq) + __H2(g)

4. How many moles of ammonia contain 1.51 x 1024 NH3 molecules?

5. What is the [OH-] in a seawater sample if the pH is 8.65?

6. If the hydrogen ion concentration of a 0.100 M HC3H5O3 solution is 0.0038 M, what is the ionization constant for lactic acid??

Solution Preview

1. What is the volume of 1.20 x 1022 molecules of nitric oxide gas, NO, at STP?

solution:

1 mole of NO = 6.02 x 10^23 molecules

so, 6.02 x10^23 molecules of NO at STP have volume = 22.4 L
and 1.20 x 10^22 molecules will have volume = 22.4 x 1.20x10^22/6.02x10^23 = 0.4465L

2. What is the mass of sodium phosphate (163.94 g/mol) that yields 1.00 g of calcium phosphate (310.18 g/mol) precipitate?
__CaCl2(s) ...

Solution Summary

The solution studies chemistry element questions.

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