To solve for the enthalpy of reaction, we apply the Hess's Law.
ΔHrxn = ∑(ν×Hf of products) - ∑(ν×Hf of reactants)
where
v is the stoichiometric coefficient determined from the balanced reaction
Hf is the standard heat of formation; these are empirical values:
*For CH₄: Hf = <span>−74.87 kJ/mol
*For O</span>₂: Hf = 0
*For CO₂: <span>-393.5 kJ/mol
*For H</span>₂O: <span>-241.82 kJ/mol
</span>ΔHrxn = [(2*-241.82 kJ/mol)+(1*-393.5 kJ/mol)] - [(1*−74.87 kJ/mol)+(2*0 kJ/mol)] =<em> -802.27 kJ/mol</em>
B. 1.95 x 10-3 moles.. that can be consumed by 0.65 mL of 0.1m
Answer:
cant understand the grammer rewrite and ill answer
Explanation:
Answer: Natural sources of light
please give brainliest
There are <u>0.408 grams</u><u> </u>of sodium fluoride in the toothpaste.
Why?
We know that there is 0.24% of sodium floride in a 170 grams toothpaste tube. Since the only information related to the toothpaste is its mass, we can assume that the 0.24% (concentration) is referring to the mass percent, and we can calculate it using the following equation:

Now, substituting the given information and calculating, we have:


We have that there are 0.408 grams of sodium fluoride in the toothpaste.
Have a nice day!