Problem #2 – calculate how many moles are in 17.0 grams of H 2 O 2. 17.0 grams are given in the text of the problem. The molar mass is 34.0146 grams/mole, which is calculated using the formula and the atomic weights on a periodic table. You may want to calculate this value as a double-check of your mastery of calculating molar masses.

Worked Example of Using Mole Ratio to Calculate Mass of Reactant or Product. The Question: 12.2 g of magnesium metal (Mg (s)) reacts completely with oxygen gas (O 2(g)) to produce magnesium oxide (MgO (s)). Calculate the mass of oxygen consumed during the reaction and the mass of magnesium.

This is because there are 1000 millimoles in a mole. 2.55/1000 gives you 0.00255 moles. How do you calculate the number of moles in 56 millimole Na-OH?. = 180 mg Long example for water.

From every two atoms of P, one molecule of P2O5 is formed. The relative formula mass of two atoms of P (phosphorous) is 62, whereas for one molecule of P2O5 it is 142.

It contains two hydroxide ions (OH-) per formula unit, so the number of hydroxide ions per liter in 1.8 x 10E-6 M solution is: 2(1.8 x 10E-6) = 3.6 x 10E-6. However, this doesn’t technically answer the question, as most of these hydroxide ions will not have dissociated from the magnesium ions due to the compound’s low solubility.

Magnesium hydroxide, Mg(OH) 2, is commonly used as the active ingredient in antacid tablets.A student analysed an antacid tablet for mass percent Mg(OH) 2 by dissolving a tablet weighing 1.462 g in 25.00 mL of 0.953 M HCl, and neutralizing the unreacted HCl. That neutralization required 12.29 mL of 0.602 M NaOH.Calculate the mass percent of Mg(OH) 2 in the antacid tablet.

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Determine the number of ammonia molecules in 4.85g of ammonia (N A = 6.022 x 10 23 mol-1). 11. Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2. 12. Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain. Calculate the mass in grams of 3.65 × 10 20 molecules of sulfur trioxide.

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2. A) 3.28 mol B) 2.32 mol C) 0.431 mol D) 0.305 mol E) 0.200 mol. 199. Phosphorus pentachloride, PCl 5, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions.

If one antacid tablet contains 0.10g of Magnesium hydroxide how many grams of stomach acid does this tablet neutralize?

The formula unit for magnesium hydroxide is Mg(OH)2. This shows that in each formula unit there are two oxygen atoms, two hydrogen atoms, and one magnesium atom for a total of five atoms altogether.

Jan 11, 2015  · I get moles HCl = (134.32 x 1)/1000 = 0.134 mol moles remaining = (28.75 x 0.2)/1000 = 0.00575 mol So moles used up = 0.134 – 0.00575 = 0.1285 Mr of Mg(OH)2 = 58 moles of Mg(OH)2 = 0.1285/2 = 0.064 So mass Mg(OH)2= 58 x 0.064 = 3.72g 1 tsp.

From the equation you know that 1 mole of Mg(OH) 2 can neutralize 2 moles of HCl. Now you need to calculate how many moles of HCl needs to be neutralize. For this purpose you need to multiply concentration of the acid by its volume (convert in L): 0.1M (that is moles per L)*0.025 L (converted from 25 mL)=0.0025 moles.

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Jan 11, 2015  · I get moles HCl = (134.32 x 1)/1000 = 0.134 mol moles remaining = (28.75 x 0.2)/1000 = 0.00575 mol So moles used up = 0.134 – 0.00575 = 0.1285 Mr of Mg(OH)2 = 58 moles of Mg(OH)2 = 0.1285/2 = 0.064 So mass Mg(OH)2= 58 x 0.064 = 3.72g 1 tsp.

1. Write the chemical equation for the reaction of an antacid containing magnesium hydroxide, Mg(OH) 2, with stomach acid (hydrochloric acid, HCl) and then balance the equation. 2. If a tablet of the antacid neutralized 41.4 mL of 0.150 M hydrochloric acid then how many grams of magnesium hydroxide was in.

Number of Moles Formula. A mole of a defined substance is defined as the mass of that substance containing the same number of fundamental units just like atoms in 12.0 g of 12 C. These fundamental units can be atoms, molecules, or formula units based on the substance.

Write down the Ksp expression for Ag2CrO4. If the solubility of Ag2CrO4 is 0.0216 g/L, calculate the value of Ksp. asked by Chenny on April 12, 2010; Science. When magnesium oxide (MgO) and water (H20)react, they produce magnesium hydroxide Mg(OH)2. Magnesium hydroxide is a medicine used to treat an upset stomach.

0.775 g Na 2 CO 3 x 1 mole x 2 mole HCl x 1 L x 1000 mL = 13.4 mL 106 g 1 mole Na 2 CO 3 1.09 moles 1 L. 3. Calculate the number of grams barium carbonate that can be precipitated by adding 50.0 mL of 0.424 MBa (NO 3) 2.

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