Calculate the mass in gram of Na+ in 25g of Na2SO4

8 grams

Explanation:

= 23 x 2 = 46

= 32.1 + (16 x 4) = 96.1

In 25g,

So there are 8g Na+

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c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.