Answer:
585 kcal
.
Explanation:
- From the balanced equation:
<em>2Cl₂(g) + 7O₂(g) + 130 kcal → 2Cl₂O₇.</em>
130 kcal are needed to produce 2 mol of Cl₂O₇.
<em><u>Using cross multiplication:</u></em>
130 kcal are needed to produce → 2 mol of Cl₂O₇.
??? kcal are needed to produce → 9 mol of Cl₂O₇.
<em>∴ The energy required to produce 9.00 mol of Cl₂O₇ </em>= (130 kcal)(9 mol)/(2 mol) = <em>585 kcal.</em>
The answer would be 5.5g because you have to subtract 8.2 minus 2.7 and you get 5.5g so basically the answer is C.
Molar mass of CuSO4*5H2O = <span>63.5 + 32 + 4(16) + 5(18) = 249.5 g/mole
molarity is calculated as follows:
molarity = number of moles of solutes/liters of solution
We will assume that the number of liters = 1
Substituting in the above equation:
0.02 = number of moles of CuSO4*5H2O / 1
number of moles = 0.02 moles
number of moles = mass/molar mass
mass = number of moles * molar mass
mass = 0.02 * </span><span>249.5 = 4.99 grams</span>
Answer:
50g
Explanation:
At the end of the burning process, the mass of the jar and smoke should be 50g after the candle burning is done.
In most systems, the law of conservation of matter finds expression. According to this law "matter is neither created nor destroyed but atoms are rearranged".
In this kind of system, no matter is allowed to escaped and the starting mass of the reactants compared to that of the product will be the same.