Answer:
12.4g of water has 0.689 moles of water.
Explanation:
Molar weight of
= 16 + 2 = 18g
One mole of
weighs 18g.

Hence, 12.4g of water has 0.689 moles of water.
23.67 g unless you're rounding to significant figures than it's 24 g
Too freaking many... or maybe not many at all
Answer:
Kr has one more electron than br and so, the nuclear charge increase, which means the nuclear attraction between the nucleus and outer most electron will increase and so will be harder to remove the electron from Kr than Br, so Kr has higher 1st ionisation.
Mark me brainliest!
God bless!