chemistry
How many grams of mercury are formed from 47.0 of HgO? How many grams of oxygen are formed from 47.0 of HgO? How many grams of HgO would you need to obtain 34.1 of O2?
chemistry
What mass of oxygen is needed for the complete combustion of 2.50×10−3 of methane?
chemistry
What mass of water is produced from the complete combustion of 2.50×10−3 of methane?
chemistry
What mass of carbon dioxide is produced from the complete combustion of 2.50×10−3 of methane?
chemistry
A scientist wants to make a solution of tribasic sodium phosphate,Na3PO4 , for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 550 ml of a solution that has a concentration of Na+ ions of 1.40M ?
Chemistry
1.29g H2 is allowed to react with 10.3g N2 , producing 1.86g NH3. What is the theoretical yield for this reaction under the given conditions? What is the percent yield for this reaction under the given conditions? I have been stucks for days now.
Geometry
Find the area of a regular pentagon with a side of 6ft. Give the answer to the nearest tenth. 123.9ft2 49.5ft2 61.9ft2 12.4ft2
Geometry
Find the surface area of a conical grain storage tank that has a height of 42 meters and a diameter of 20 meters. Round the answer to the nearest square meter. 3,028m2 3,971m2 1,357m2 1,671m2
Geometry
Find the surface area of a sphere with a circumference of 40 ft. Round to the nearest tenth.
precalc help
cos(15degrees) this is not plugging it in the calculator, please help me right down steps. i really need help.
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