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- cricket A ♡ | 32% 8:47 PM 25. Some people like to make their own hand lotion because it can be less expensive than buying it and they have the ability to add only the fragrances that they like. A recipe for hand lotion calls for mixing 327 g of water (H,O) with 311 g of glycerin (C3H3O3). This recipe makes a total of 550. mL of hand lotion. (a) What is the mass percent of glycerin in the hand lotion? (b) What is the molarity of glycerin in the hand lotion? OÇR OCR Sign Delete2.) Calculate the moles of KHP in flask #2. grams KHP Molar Mass of KHP (A2) 204.22 g/mol moles KHP %3D Cal .009 (A11) %3D NOR 204.22 g/mol04/22/ 2021 ot art e b NAME Kouri KulRu DATE SECTION POSTLABORATORY ASSIGNMENT 1. Calculate the theoretical percentage of water for the following hydrates. (a) manganese(II) monohydrate, MnSO4 • H2O (b) manganese(II) tetrahydrate, MNSO4 • 4H2O 2. An unknown hydrate, AC• XH»O, has a mass of 1 .00 g before heating, and 0.738 g atter heating. What is the experimental percentage of water in the hydrate? ombvl lo slmo noihesilla logataW If the anhydrous compound (AC) has a molar mass of 101 g/mol, what is the water of crystallization (X) and the formula for the hydrate (AC XH,O)?ouphut suf (snoilgo) ai sh Formula of hydrate AC H20 Water of crystallization
- Effervescent tablets contain both citric acid (C6H8O7) and sodium bicarbonate (NaHCO3) and release carbon dioxide gas when dissolved in water as well as forming trisodium citrate (Na3C6H5O7) and water. A typical effervescent tablet contains 1.00 g of citric acid and 1.92 g sodium bicarbonate. (a) Assuming that carbon dioxide acts as an ideal gas, determine the work done due to the evolution of carbon dioxide by the dissolution of one effervescent tablet in water at 25.0 °C and atmospheric pressure (1 atm i.e. 101325 Pa).A certain liquid X has a normal freezing point of 7.10°C and a freezing point depression constant =Kf3.27·°C·kgmol−1. A solution is prepared by dissolving some ammonium chloride (NH4Cl) in 700.g of X. This solution freezes at 6.4°C. Calculate the mass of NH4Cl that was dissolved. Round your answer to 1 significant digit. __g(Q54) How many grams of carbon dioxide gas will be dissolved in 769 mL of water at 25°C held at a pressure of 0.882 atm? (3 sf)
- At 16223 oC, Keq = 2.29 for the reaction: 1/2 N2(g) + 1/2 O2(g) NO2(g) (a) What is the value of Keq for the reaction NO2(g) 1/2 N2(g) + 1/2 O2(g)?Keq = (b) What is the value of Keq for the reaction N2(g) + O2(g) 2 NO2(g)?Keq = (c) What is the value of Keq for the reaction 2 NO2(g) N2(g) + O2(g)?Keq =A 750. mL sample of 0.13 M K2CO3(aq) is combined with 250. mL of 0.13 M Cu(NO3)2(aq) at a given temperature. At the same temperature: Ksp for CuCO3 = 1.4 × 10–10Ksp for KNO3 = 1.4 × 1010 Which of the following statements is true?The chemical analysis of a water indicates the presence of cations in the following concentrations: Na+ 53 mg/L Mg2+36 mg/L K+ 72 mg/L Fe2+ 98 mg/L Mn2+15 mg/L A local softening company advertises that its softening unit has a capacity of 1000 meq. If water is used at the rate of 15 m³ per day, how frequently (i.e. how many times) will the unit have to be regenerated to provide the householder with soft water? (Na = 23, Mg = 24.4, K = 39, Fe = 55.85, Mn = 54.94 gms/mole) Answer: 105 Check
- 3. 1986 B Three volatile compounds X, Y, and Z each contain element Q. The percent by weight of element Q in each compound was determined. Some of the data obtained are given below. Percent by Weight of Element Q Compound Molecular Weight 64.8% Y 73.0% 104. Z 59.3% 64.0 The vapor density of compound X at 27°C and 750. mm Hg was determined to be 3.53 grams per litre. Calculate the molecular weight of compound X. Determine the mass of element Q contained in 1.00 mole of each of the three compounds. Calculate the most probable value of the atomic weight of element Q. Compound Z contains carbon, hydrogen, and element Q. When 1.00 gram of compound Z is oxidized and all of the carbon and hydrogen are converted to oxides, 1.37 grams of CO, and 0.281 gram of water are produced. Determine the most probable molecular formula of compound Z. а. b. с. d.In part 1 of this lab, you will be calculating A-H by conducting constant-pressure calorimetry measurements. One of the steps you will take is calculating AT of the water inside the test tube and then using the formula qcal = m x C, x ΔΤ. What mass (m) will you be using in the above formula? Select one: O Mass of the magnesium strip O Mass of the aqueous solution, since we are measuring its temperature using the thermometerThe density of 70.5 wt% aqueous perchloric acid is 1.67 g/mL. Note that grams refers to grams of solution (5 g HClO4 1 g H2O). (a) How many grams of solution are in 1.00 L? (b) How many grams of HClO4 are in 1.00 L? (c) How many moles of HClO4 are in 1.00 L? This is the molarity.