One molecule of P2O3 = 1 mole. Go to the Periodic Table P = 30gm x 2 = 60 gm. O= 16 gm x 3 = 48 mg. Total is 60 + 48 = 108 gm is the weight of one molecule which is also the number of grams in 1 mole (remember 1 mol = 1 mole). So since you have 37.9 grams divide this by 108 and you have .35 moles.
Using the periodic table we can find the molecular weight of H3PO4:
for hydrogen: 3*1.01 g/mol = 3.03
for phosphorus: 1*30.97 g/mol = 30.97
for oxygen: 4*16.00 g/mol = 64.00
Adding these all up you get 98.0 g/mol
Now divide the mass of 37.1 g by the molecular weight of 98 g/mol to get the number of moles. In this case: 0.38 moles of H3PO4
Each mole P4O10 needs 6 moles of water to form (4 moles of) H3PO4 to balance the equation:
P4O10 + 6H2O --> 4H3PO4
so for 71.0 g P4O10 it comes to:
71.0(g P4O10) / 98.0(g P4O10/mol P4O10) = 0.724 mol P4O10
and this needs 6*0.724 = 4.35 mole H2O
The molar mass of H3PO4 is approximately 98 g/mol.
If you have 9.17 grams of H3PO4 then by unit analysis we have to divide by the molar mass to cancel grams and to find moles.
9.17 (grams) / 98 (grams/mol) = .0936 mol H3PO4
M = 3(1.0) + 31 + 4(16) = 98 g/mol
n = 5 g x (1 mol/98 g) =0.051 mol
H3PO4 is phosphoric acid, H2PO4 is an ion and would need another ion.
H3PO4 has a molar mass of 98g/mole. 100g x 1mole/98g = 1.02 mole
0.306 moles H3PO4
The answer is 0,306 moles.
The answer is 0,003 mol.
100 grams oxygen (1 mole O/16 grams)(2 mole Fe/3 mole O) = 4.17 moles iron --------------------------
450 g water 100g sugar 30g vinegar 2g salt for vinegar use2.4 g of acetic acid
16 grams of oxygen how many moles is 0,5 moles.
moles of what?
2 moles of Ca and 4 moles of OH
100 grams oxygen (1 mole O/16 grams)(2 mole Fe/3 mole O) = 4.17 moles iron --------------------------
This is a mass stoichiometry problem. Start with the balanced equation: CaCO3 --> CaO + CO2. Do a conversion from 50g CaO to moles: 56g/1mol=50g/x, x=.9 moles. The equation is balanced as written, with all coefficients understood to be 1. So: .9 moles CaO means .9 moles CaCO3. Do another conversion from moles to grams: 100g/1mol=x/.9 moles. Solve for x to get 90 grams. (56g=molar mass of calcium oxide; 100g=molar mass of calcium carbonate.)
1 mol = 118.94 1 mol / 118.94 = 1.70 / x G = 202.10g
moles = mass (g) divided by the molecular weight (g/mol) moles = 100g/12.01
63,5kcal/100g tofu
n=(1atm)(49L)/(0.0821)(273.15)=2.19 moles2.19 moles x 44g of CO2 =96.36g of CO22.19 moles x 100g of CaCO3= 219g of CaCO3
the atomic mass of gallium is approximately 69.72 g/mol therefore the mass of 100 grams of gallium would be 100g divided by 69.72g/mol which gives us approximately 1.43 moles
266 cal per 100g
In H2O the conjugate base is H2PO4-, being conjugated to the acid H3PO4. As well: H3PO4 is conjugated acid to the base H2PO4-.
H3PO4 + 1 OH- --> H2PO4- + 1 H2O H3PO4 + 2 OH- --> HPO42- + 2 H2O H3PO4 + 3 OH- --> PO43- + 3 H2O
phosphate
First a balanced chemical equation is needed.CH4 + 2O2 -> CO2 + 2H2OThere is a 1:1 ratio of moles between methane and carbon dioxide so the amount of moles of methane used is the exact number of moles of carbon dioxide yielded.To determine the number of moles of methane we take the amount used and divide by methane's mass which is about 16.04 g/mol.100g/ 16.04g/mol=6.234moles of methane.6.234 moles of methane are used and 6.234 moles of carbon dioxide are produced.