Answer: 78.69 g of Fe
Explanation: Iron(III) oxide is Fe2O3. It has a molar mass of 159.7 g/mole. That consists of:
2 x Fe at 55.85 = 11.69 or 69.94%
3 x O at 16.0 = 48.0 or 30.06%
Therefore 112.5 grams will contain (112.5 g)*(69.94%) = 78.69 g of Fe
Answer:
sour
Explanation:
Sour is a characteristic property of all acids in aqueous solution.
Answer:
- Heat energy is transferred from homes by conduction through the walls, floor, roof and windows. It is also transferred from homes by convection. For example, cold air can enter the house through gaps in doors and windows, and convection currents can transfer heat energy in the loft to the roof tiles.
- Convection is the heat transfer due to the movement of a fluid, such as a gas or liquid, and carries heat energy away from the source of heat. When a substance is heated, it causes its particles to vibrate more. The more vibration, the more space they will take up and the less dense they will become.
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Answer : The mass of NaCl needed would be, 86.1 grams.
Explanation :
Formula used for Elevation in boiling point :
![\Delta T_b=i\times k_b\times m](https://tex.z-dn.net/?f=%5CDelta%20T_b%3Di%5Ctimes%20k_b%5Ctimes%20m)
or,
![\Delta T_b=i\times k_b\times \frac{w_2\times 1000}{M_2\times w_1}](https://tex.z-dn.net/?f=%5CDelta%20T_b%3Di%5Ctimes%20k_b%5Ctimes%20%5Cfrac%7Bw_2%5Ctimes%201000%7D%7BM_2%5Ctimes%20w_1%7D)
where,
= change in temperature = ![1.500^oC](https://tex.z-dn.net/?f=1.500%5EoC)
= boiling point constant = ![0.5100^oC/m](https://tex.z-dn.net/?f=0.5100%5EoC%2Fm)
m = molality
i = Van't Hoff factor = 2 (for NaCl electrolyte)
= mass of solute (NaCl) = ?
= mass of solvent (water) = 1001 g
= molar mass of solute (NaCl) = 58.5 g/mol
Now put all the given values in the above formula, we get:
![1.500^oC=2\times (0.5100^oC/m)\times \frac{w_2\times 1000}{58.5g/mol\times (1001g)}](https://tex.z-dn.net/?f=1.500%5EoC%3D2%5Ctimes%20%280.5100%5EoC%2Fm%29%5Ctimes%20%5Cfrac%7Bw_2%5Ctimes%201000%7D%7B58.5g%2Fmol%5Ctimes%20%281001g%29%7D)
![w_2=86.1g](https://tex.z-dn.net/?f=w_2%3D86.1g)
Therefore, the mass of NaCl needed would be, 86.1 grams.
Answer: 700cm
Explanation:
There's 100cm in 1 meter. Multiply 7 meters by 100 to get 700 cm.