# chemistry

posted by .

calculate the mass of phosphorus required to make 200g of phosphine ,PH3 by the reaction:
P4(S) +3NaOH(aq) +3H2O(I) ¨3NaH2PO4(aq) +PH3(g)

• chemistry -

I think you mean 4P not P4
4P(S) +3NaOH(aq) +3H2O(I) ¨3NaH2PO4(aq) +PH3(g)

You need 4 P atoms on the left for every PH3 molecule on the right

atomic mass of P = 31
molecular mass of PH3 = 31+3 = 34
so every gram of PH3 has (31/34) grams of P
but we need 4 times that much to provide the other three in 3NaH2PO4
so for every gram of PH3 we need 124/34 grams of P
so
200 (124/34) = 729 grams of P

## Similar Questions

1. ### chemistry

what is the maximum number of grams of PH3 that can be formed when 6.2grams of phosphorus reacts with 4.0 grams of hydrogen to form PH3?
2. ### chemistry

what is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3
3. ### Chemistry

The boiling point of phosphine, PH3(-88C) is lower than that of ammonia, NH3(-33C) even though phosphine has twice th molar mass of NH3. Why?
4. ### chemistry

Many reaction involving heterogeneous catalysts are zeroth order, that is rate=k. An example is the decomposition of phosphine (PH3) over tungsten (w): 4Ph3---> P4 + 6H2 It is found That the reaction is independent of PH3. As lon …
5. ### chemistry

enthalpy change^H is +23kJ mol-1 of phosphine (PH3) for the reaction 2P(s)red+3H2(g)---->2PH3(g) a) Calc. entropy change for this reaction. Explain how this information allows you to determine the spontaneity or non-spontaneity …
6. ### MSJH

When heated, elemental phosphorus, P4, produces phosphine, PH3, and phosphoric acid, H3PO4. How many grams of phosphine are produced if 56 grams of P4 have reacted?
7. ### chemistry

When heated, elemental phosphorus, P4, produces phosphine, PH3, and phosphoric acid, H3PO4. How many grams of phosphine are produced if 56 grams of P4 have react
8. ### chemistry

For each pair of substances listed below, identify the one with the lower boiling point. (a) Silane (SiH4) and Phosphine (PH3) answer = silane (b) Ammonia (NH3) and Phosphine (PH3) answer = phosphine (c) Lithium fluoride (LiF) and …
9. ### Chem

I just need to know if I did the problem correctly. The decomposition of phosphine, a very toxic gas, forms phosphorus and hydrogen in the following reaction: 4PH3(g) → P4(g) + 6H2(g) If the instantaneous rate of the reaction …
10. ### Chemistry

The oxidation of phosphine (PH3) to phosphorus pentoxide (P2O5) is given by the chemical equation: _PH3+O2-->_P2O5+H2O A.balance the chemical equation B.how many grams of O2 will react completely with 35.0grams of PH3?

More Similar Questions