Answer:
P4Se3
Explanation:
Applying the Law of Conservation of Mass:
(133 mg total) - (45.8 mg P) = 87.2 mg Se
Dividing by the molar mass,
Phosphorus:-(45.8 mg P) / (30.97376 g P/mol) = 1.4786 mmol P
Selenium:-(87.2 mg Se) / (78.96 g Se/mol) = 1.1044 mmol Se
Divide by the smaller number of millimoles:
(1.4786 mmol P) / 1.1044 mmol = 1.339
(1.1044 mmol Se) / 1.1044 mmol = 1.000
multiply by 3, to get a whole number interger. then round to the nearest whole numbers to find the empirical formula.
Therefore the empirical formula is P4Se3
Answer:
Lubrication in vehicles. When you put oil into your car or truck, you should be aware of its viscosity
Cooking. Viscosity plays a significant role in the preparation and serving of food.
Manufacturing. Manufacturing equipment requires appropriate lubrication to run smoothly.
oh, and medicine
I think that it is half are required to react with 40 g of HF.
Answer:
Q= 245 =2.5 * 10^2
Explanation:
ΔG = ΔGº + RTLnQ, so also ΔGº= - RTLnK
R= 8,314 J/molK, T=298K
ΔGº= - RTLnK = - 6659.3 J/mol = - 6.7 KJ/mol
ΔG = ΔGº + RTLnQ → -20.5KJ/mol = - 6.7 KJ/mol + 2.5KJ/mol* LnQ
→ 5.5 = LnQ → Q= 245 =2.5 * 10^2
Acids:
<span><span>Acetic acid (CH3COOH): vinegar, acetate
</span><span>Acetylsalicylic acid (HOOCC6H4OOCCH3): aspirin
</span><span>Ascorbic acid (H2C6H6O6): vitamin C
</span><span>Carbonic acid (H2CO3): soft drinks, seltzer water
</span><span>Citric acid (C6H8O7): citrus fruits, artificial flavorings
Bases:
</span></span><span><span>Aluminum hydroxide (Al[OH]3): antacids, deodorants
</span><span>Ammonium hydroxide (NH4OH): glass cleaner
</span><span>Calcium hydroxide (Ca[OH]2): caustic lime, mortar, plaster
</span><span>Magnesium hydroxide (Mg[OH]2): laxatives, antacids
</span><span>Sodium bicarbonate/sodium hydrogen carbonate (NaHCO3): baking soda</span></span>