Answer is: the specific heat capacity of the metal is <span>A) 0.129 J/gK.
</span>m(metal) = 15,1 g.
Q = 48,75 J.
ΔT = 25 K.
Q = C · ΔT · m(metal).
C = Q ÷ ΔT · m(metal).
C = 48,75 J ÷ 25 K · 15,1 g.
C = 0,129 J/g·K.
The list of the answer choices is missing.
I did some research in internet and found this is the complete question, including the answer choices:
<span>Which is true about dissolving a polar substance in water?
A. The solvent particles are all nonpolar molecules.
B. The solute particles are carried into the solution.
C. The solute particles have no attraction for the solvent molecules.
D. The solute particles are very different from the solvent molecules.
The right answer is the option B. The solute particles are carried into the solution.
Let's review each choice.</span><span>
A. The solvent particles are all nonpolar molecules.
False
The solvent is water, and water is a polar solvent. This is, due to the difference in electronegativity of the atoms of H and O, the bonds form dipoles (the O atoms have a partial negative charge and the H atoms have a partial positive charge). And, since the molecule is not symmetrical those dipoles yield a polar molecule.
B. The solute particles are carried into the solution.
That is true: being the solute a polar substance the negative endings of the solute will be attracted by the partially positive H of water, and the positive endings of the solute will be attracted by the partially negative O of water, meaning that the molecules of water will surround the particles of solute.
C. The solute particles have no attraction for the solvent molecules.
As per the explanations given above this is false.
D. The solute particles are very different from the solvent molecules.
False, because the solute particles are similar to the solvente molecules in that both of them are polar.
</span>
Answer:
40.02 calories
Explanation:
V = 10 mL = 10g
we know t went <em>up</em> by 4°C, this is our ∆t as it is a change.
Formula that ties it together: Q = mc∆t
where,
Q = energy absorbed by water
m = mass of water
c = specific heat of water (constant)
∆t = temperature change
Q = (10 g) x (4.186 J/g•°C) x (4°C)
Q = 167.44 J
Joules to Calories:
167.44 J x 1 cal/4.184 J = 40.02 calories
(makes sense as in image it is close to the value).
1297 grams of ore are needed to obtain 454.0 grams of Fe.
As the iron ore sample if found to be 35 percentage by mass
It means 35g of iron is present in 100g of ore.
1g of iron is present in 100/35 g of ore
And 454.0 g of iron is present in 100 × 454 / 35
= 1297.14 or 1297 grams (approx.)
The mass percent is calculated by dividing the mass of the compound or solute by the mass of the element or solute. A percent is obtained by multiplying the result by 100.
The formula for an element's percentage in a compound is as follows:
mass percent is calculated by multiplying the mass of the element in one mole of the compound by one hundred.
A solution follows this formula:
(gm of solute / gm of solute plus solvent) × 100 equals mass percent.
or
(gm of solute/grams of solution) x 100 Equals mass percent
Hence, 1297 grams of ore are needed to obtain 454.0 grams of Fe.
Learn more about Mass percent here brainly.com/question/26150306
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Becouse melting point and cooling point are two opposite things one is 100degrees nd other 0degrees