How many fg of hydrogen are in 8.0 mg of strontium hydride?
A 0.67 mg sample of nitrogen reacts with hydrogen to form 0.8146 mg of hydride. What is the empirical formula of the nitrogen hydride?
41. Suppose you have half a mole of sulfur atoms. How many sulfur atoms do you have? 42. How many micrograms of zinc carbonate are there in 52.0 x 10-5 moles? 43. When 90 grams of water is evaporated, how many atoms of hydrogen was lost? 44. How many picoliters of water are in 3.32 mol of water? 45. How many centiliters of sulfuric acid are in 32.9 x 10-23 molecules of acid? The density of sulfuric acid Page 6...
10. Hydrogen gas can be produced from the reaction of calcium hydride and water. CaH, (s) + 2 H20 (1) ► 2 H2(g) + Ca(OH)2 (aq) How many grams of calcium hydride are needed to produce 2.5 L of hydrogen gas, collected over water at 26°C and 760. torr total pressure?
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much would remain after 112.4 years?
Mg metal reacts with HCl to produce hydrogen gas. Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g) How many grams of magnesium are needed to prepare 6.90 L of H2 at 775 mmHg and 20 ∘C?
1. How many Mg are in 187 g? a. 1.87x106 Mg b. 1.87x10-8 Mg c. 1.87x10-4 Mg d. 1.87x10-6 Mg 2. What is the volume of a sample with a density of 8.05 g/mL and a mass of 3.54g? a. 0.440 mL b. 2.27 mL c. 11.6 mL d. 28.5 mL 3. Which of the following is a non-metal? a. Indium b. Antimony c. Nitrogen d. Strontium 4. A cell is put into solution and eventually bursts. How can we...
Calcium hydride (CaH2) reacts with water to form hydrogen gas: CaH2(s) + 2H2O(l) → Ca(OH)2(aq) + 2H2(g) How many grams of CaH2 are needed to generate 45.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32 °C?
How many grams of strontium hydroxide octahydrate are in 400 ml of a 0.025 M solution?
The radioactive isotope strontium-81 is used in medical imaging as indicated on the table above. If 57.7 milligrams of strontium-81 is administered to a patient, how many milligrams are left in the body after 44.4 minutes?mg
Calcium hydride, CaH2, reacts with water to form hydrogen gas: CaH2 (s) + H20 (1) --> Ca(OH)2 (aq) + 2 H2 (g) This reaction is sometimes used to inflate life rafts when a simple, compact means of generating H2 is desired. How many grams of CaH2 are needed to generate 115 Lof H2 gas with a pressure of 815 torr at 19 °C? (MMCAH2 = 42.098 g/mol, MMH20 = 18.02 g/mol, MMCA(OH)2 = 74.098 g/mol, MMH2 = 2.02 g/mol)