# chemistry

a) balance the equation:
H3PO4 + Ca(OH)2 --> Ca3(PO4)2 + H2O
b)what mass of each product results if 750 mL of 6.00 M H3PO4 reacts according to the equation?

i balanced it with:
2H3PO4 + 3Ca(OH)2 --> Ca3(PO4)2 + 6H2O

but i'm not sure where to go from there

also,

A solution is made by dissolving 26.42 g of (NH4)2SO4 in enough H2O to make 50.00 mL of solution.

a) what is the molar mass of (NH4)2SO4?
b) what are the products of the solution?
c) how many milliliters of solution are needed?

i got:
a) 196g/mol
b) (NH4)2SO4 + H2O --> NH4O + SO4H
c) 2.7 M

i'm sure a and c is right.. just unsure about b

sorry for the long post, thanks !

1. 👍
2. 👎
3. 👁
4. ℹ️
5. 🚩
1. H3PO4 equation is balanced.
Convert what you have to mols. M x L = mols.
Convert mols of what you have to mols of what you want.
Convert mols of what you want to grams.
grams = mols x molar mass.

For the second question, which is incomplete,
a is 132.141 but check my work since it doesn't agree with yours.
b. You haven't reacted it with anything but water, It will ionize into NH4^+ and SO4^=
c. How many mL are needed for what??

1. 👍
2. 👎
3. ℹ️
4. 🚩
2. What I would first is to find the amount of mols of H3PO4. Since you know that 1 M means there is 1 mol of solution in every 1 liter, you can figure out the moles of the solution. The solution is 6M, so that means that to find the moles of solute in the solution you multiply .750 (750 milliliters converted to liters) by 6. I think you did something similar, but .0075 L makes 7.5 milliliters. This will give you 4.5 mols of H3PO4.

Now you can use stoichiometry to find the grams of Ca3(PO4)2. The balanced equation states that it takes 2 mols of H3PO4 to get 1 mol of Ca3(PO4)2:

4.5 mol H3PO4 * 1 mol Ca3(PO4)2 / 2 mol H3PO4 = 2.25 mol Ca3(PO4)2

Find the molar mass of Ca3(PO4)2 to convert the mols to grams:
3*40 + 2*31 + 8*16 = 310 grams / mol

2.25 mol Ca3(PO4)2 * 310 grams Ca3(PO4)2 / 1 mol Ca3(PO4)2 = 697.5 grams Ca3(PO4)2

You can use the same process to find the mass of water.

4.5 mol H3PO4 * 6 mol H2O / 2 mol H3PO4 = 13.5 mol H2O

13.5 mol H2O * 18 g H2O / 1 mol H2O = 243 g H2O

Hope that helped! NB not my work. its from another website

1. 👍
2. 👎
3. ℹ️
4. 🚩

## Similar Questions

1. ### chemistry

Phosphorus pentachloride, PCl5, reacts with water to form phosphoric acid, H3PO4, and hydrochloric acid, HCl. PCl5(s) + 4H2O() → H3PO4(aq) + 5HCl(aq) (a) What mass of PCl5 is needed to react with an excess quantity of H2O to

2. ### Chemistry

1.Hydrogen gas can be made by reacting methane (CH4) with high temperature steam: CH4(g) + H2O(g) ----- CO(g) + 3H2(g) How many hydrogen molecules are produced when 256 grams of methane reacts with steam? 2. Ammonia (NH3) reacts

3. ### Science

Please help me PCl5 + H2O → H3PO4 + HCl What coefficients will balance the equation? 1, 4, 1, 5 1, 5, 1, 1 2, 5, 1, 2 2, 4, 2, 5 And NH4OH(aq) → H2O(l) + NH3(g) What coefficients will balance the equation? 1, 2, 2 3, 3, 4 2,

4. ### CHEMISTRY PLEASE!!! ( I NEED HELP ASAP)

Consider the reaction H3PO4 + 3NaOH → Na3PO4 + 3H2O. How much Na3PO4 can be prepared by the reaction of 3.43 g of H3PO4 with an excess of NaOH? For the reaction ?Fe+?H2O → ?Fe3O4 +?H2, what is the maximum amount of

1. ### chemistry

8.What is the mass of 4.56 moles of sulfur dioxide? 9.What is the mass of 4.56 molecules of sulfur dioxide? 10.How many formula units are in 0.456 grams of Ca3(PO4)2? 11.How many moles are in 1.5 x 10 ^23 atoms of fluorine?

2. ### chemistry HWK MAKES NO SENSE

balance: H3PO4 + Mg(OH)2 → Mg3(PO4)2 + H2O

3. ### Chemistry

Ca3(PO4)2 + 3 H2SO4 -> 3 CaSO4 + 2 H3PO4 What masses of calcium sulfate and phosphoric acid can be produced from the reaction of 1.0 kg calcium phosphate with 1.0 kg concentrated sulfuric acid (98% H2SO4 by mass)?

4. ### chemistry

Calcium carbonate reacts with phosphoric acid to produce calcium phosphate, carbon dioxide, and water. 3 CaCO3(s) + 2 H3PO4(aq) Ca3(PO4)2(aq) + 3 CO2(g) + 3 H2O(l) How many grams of phosphoric acid react with excess calcium

1. ### Chemistry

What is the total ionic equation of this: 3CaCl2(aq) + 2K3PO4(aq) → Ca3(PO4)2(s) + 6KCl(aq) Shw all physical states of the reactants and products

2. ### chem hwk help!

Given the following reaction: 3 CaCl2 + 2 H3PO4 Ca3(PO4)2 + 6 HCl How many grams of H3PO4 are needed to react completely with 1.837 g of CaCl2? I don't understand at all

3. ### Chemistry

Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction:H3PO4 + Mg(OH)2 -----> Mg3(PO4)2 + H2O.Balance the equation, then enter the coefficients

4. ### Chemistry

Teeth and bones are composed, to a first approximation, of calcium phosphate, Ca3(PO4)2(s). The Ksp for this salt is 1.3 10-32 at 25°C. Calculate the concentration of calcium ion in a saturated solution of Ca3(PO4)2. Please,