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with these 3 if you can please help 

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for some reason, the image won't I am sorry, I am having trouble with these 3...
When 77.6 g of calcium and 33.0 g of nitrogen gas undergo a reaction that has a 84.8% yield, what mass of calcium nitride forms? g calcium nitride
Can you please help me with these two problems
Calculate the number of Hions in 0.244 g of MgH2. X 10! Hions Enter your answer in scientific notation. Elemental sulfur occurs as octatomic molecules, Sg. What mass of fluorine gas is needed to react completely with 25.3 g of sulfur to form sulfur hexafluoride? Mass of F2(g): 45.06 gX
Sodium borohydride (NaBH4) is used industrially in many organic syntheses. One way to prepare it is by reacting sodium hydride with gaseous diborane (B2H6). Assuming an 75.1% yield, how many grams of NaBH4 can be prepared by reacting 7.43 g of sodium hydride and 8.16 g of diborane? Calculate the moles of compound in 0.163 g of ammonium iodide. moles When 77.6 g of calcium and 33.0 g of nitrogen gas undergo a reaction that has a 84.8% yield, what...
1. Elemental sulfur occurs as octatomic molecules, S8. What mass (g) of fluorine gas is needed to react completely with 17.8 g of sulfur to form sulfur hexafluoride? 2. (Challenging): Solid iodine trichloride is prepared in two steps: first, a reaction between solid iodine and gaseous chlorine to form solid iodine monochloride; second, treatment of the solid with more chlorine gas. (a) Write a balanced equation for each step. (b) How many grams of iodine are needed to prepare 2.45...