the answer to the first one is D and the second one is the first one
Fossil fuels about into Earth ice age time
Answer: The empirical formula of the metal sulfide is 
.
Explanation:
Given: Mass of metal = 20.38 g
Mass of metal sulfide = 31.47 g
Moles is the mass of a substance divided by its molar mass.
So, moles of cobalt (molar mass = 59 g/mol) are as follows.
Moles of bromine (molar mass = 80 g/mol) are as follows.
Now, the ratio of number of moles of cobalt and number of moles of bromine are as follows.
Moles of Co : Moles of Br = 1 : 2
Hence, the empirical formula is .
Thus, we can conclude that the empirical formula of the metal sulfide is .
Answer:
O B. Convert the 10 g of NaCl to moles of NaCl.
Explanation:
The formula for finding the molality is m=moles of solute/kg of solvent. The solute for this question is NaCl and the solvent is water.
(10g NaCl)(1 mol NaCl/58.44g NaCl)=0.1711 mol NaCl
58.44 is the molar mass of NaCl
m=0.1711 mol NaCl/2 kg H2O
m=0.085557837
Electrolyte solutions are substances that give ions when dissolved in water. <span>These solutions </span>conduct electricity<span> due to the mobility of the positive and negative ions, which are called cations and anions. Hope this answers the question. Have a nice day.</span>
