7 g of common salt is kept in water in a dish and the dish is heated until all the water evaporates. The weight of salt left in
the dish will be
a 9 g
b 10 g
C 79
d 89
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Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

What is the relation between concentration of reactants and the rate of chemical reaction?

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5