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3 years ago

6

How many grams of calcium phosphate can be produced when 78.5 grams of calcium hydroxide reacts with excess phosphoric acid? Unb

alanced equation: H3PO4 + Ca(OH)2 → H2O + Ca3(PO4)2 So I balanced the equation as 2H3PO4 + 3Ca(OH)2 = 6H2O + Ca3(PO4)2 but now I am stuck

1 answer:

sasho [114]3 years ago

3 0

Once you balance the enquation you "switch partners" of the element (negative charge to positive charge)

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What is the molar mass of a gas which occupies 48.7 L at 111oC under 698 torr of pressure and has a mass of 21.5 grams?

seropon [69]

Answer:

Molar mass of the gas = 15.15 g/mol

Explanation:

PV = nRT

Where,

P = pressure

n = No. of moles

R = Gas constant

T = Temperature

P = 698 torr, 1 torr = 0.00131579 atm

$698\;torr = 698\times0.00131579 = 0.9184\;atm$

Temperature = 111 °C = 100 + 273.15 = 384.15 K

V = 48.7 L

R = 0.082057 L atm/mol K

Now, PV = nRT

$n = \frac{PV}{RT}$

$n = \frac{0.9184\times48.7}{0.082057\times384.15}$

=1.4189 mol

Molar mass = Mass/ No. of moles

= 21.5/1.4189

=15.15 g/mol

8 0

3 years ago

How do I find the electronegativity of an element

pychu [463]

Oxygen is the 2nd most electronegative element. When you examine a periodic table, you will find that (excluding the noble gases) the electronegativity values tend to increase as you go to the right and up. The reverse statement is that the values tend to decrease going down and to the left.

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3 years ago

Calculate how many grams of BeCl2 are required to produce 0.52 grams of MnCl2

Leokris [45]

Answer:

65.0cp

Explanation:

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3 years ago

According to the Lewis model of acids and bases, amines behave as bases in water because __________. View Available Hint(s) Acco

lyudmila [28]

Answer: the unshared pair of electrons on the nitrogen can accept a proton

Explanation:

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

Amines have a general molecular formula of $RNH_2$ which has lone pair of electrons on nitrogen and thus is able to donate electrons to a lewis acid which is short of electrons. In other words nitrogen can accept a proton.

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3 years ago

Fix the formula for KF2<br> Write out the full correct formula?

Korvikt [17]

Given :

A chemical compound $KF_2$ .

To Find :

Fix the formula for $KF_2$ and write the full correct formula.

Solution :

We know, Potassium( K ) and Fluorine( F ) both have a valency of 1 i.e potassium can donate one electron and Fluorine can accept one electron only.

So, the chemical formula $KF_2$ is wrong because no element has filled electron.

Therefore, to stabilise the molecule, 1 Potassium atom should make a bond from 1 Fluorine i.e KF ( correct formula ) .

Hence, this is the required solution.

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2 years ago