All categories

3 years ago

BIOCR

Chemistry

1 answer:

Amiraneli [1.4K]3 years ago

6 0

Answer:

Six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six

Explanation:

Hello there!

In this case, according to the molecular formula of the two moles of calcium phosphate:

$2Ca_3(PO_4)_2$

Thus, in order to calculate the atoms of each atom, it is necessary to multiply the two in front of the formula by the subscripts in the reaction:

$atoms Ca=2*3=6\\\\atoms P=2*2=4\\\\atoms O=2*2*4=16$

Thus, we obtain six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six.

Best regards!

You might be interested in

what is the total number of grams of NaOH needed to react completely with 196 grams of H2 SO4? regents

8090 [49]

Answer:

160 g

Explanation:

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

For $H_2SO_4$ :-

Mass of $H_2SO_4$ = 196 g

Molar mass of $H_2SO_4$ = 98 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{196\ g}{98\ g/mol}$

$Moles\ of\ Sulfuric\ acid= 2\ mol$

According to the given reaction:

$2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O$

1 mole of sulfuric acid reacts with 2 moles of NaOH

So,

2 moles of sulfuric acid reacts with 2*2 moles of NaOH

Moles of NaOH must react = 4 moles

Molar mass of NaOH = 40 g/mol

Mass = Moles*molar mass = $4\times 40\ g$ = 160 g

3 0

4 years ago

The modern-day quantum model of the atom is better than John Dalton’s model because it

IRINA_888 [86]

The modern-day quantum model of the atom known as the wave mechanical model depicts that the electron was a three dimensional wave circling the nucleus in a whole number of wavelengths allowing the waveform to repeat itself as a stable standing wave (it can absorb energy form a nearby source which is oscillating at a proper frequency) representing the energy levels of Bohr model.

7 0

3 years ago

A 581.2 mL sample of carbon dioxide was heated to 347 K.

svetlana [45]

Answer:

The temperature at 581.2 mL volume was 242.8 K.

Explanation:

Using Charle's law

$\frac {V_1}{T_1}=\frac {V_2}{T_2}$

Given ,

V₁ = 581.2 mL

V₂ = 830.5 mL

T₁ = ?

T₂ = 347 K

Using above equation as:

$\frac {581.2\ mL}{T_1}=\frac {830.5\ mL}{347\ K}$

$T_1=\frac{581.2\times 347}{830.5}\ K=242.8\ K$

The temperature at 581.2 mL volume was 242.8 K.

3 0

4 years ago

The proton-proton chain ____ (A) combines two hydrogen nuclei to produce a single helium nucleus and energy.(B) splits a helium

emmainna [20.7K]

Answer:

(C) is the mechanism that increases the temperature between the photosphere and corona of the sun.

Explanation:

When a stars is converted from hydrogen to helium then this is known as proton -proton chain reaction.Due to this reaction the temperature between corona of the sun and photosphere increases.The main reason for increasing the temperature is exothermic reaction.

So the option C is correct.

(C) is the mechanism that increases the temperature between the photosphere and corona of the sun.

8 0

3 years ago

The electron configuration represents an element in what category?

malfutka [58]

Answer:

C. transition metals

Explanation:

7 0

3 years ago

Read 2 more answers