How many grams of O2 will react completely with 35.0 grams of PH3?

Grams of O₂ : 65.92

Further explanation  

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.  

Reaction

35.0 grams of PH₃

MW PH₃ : 34 g/mol

mol PH₃ :

mol ratio  PH₃ : O₂ = 4 : 8

mol O₂ :

MW O₂ = 32 g/mol

Grams of O₂ :

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"