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pav-90 [236]
3 years ago
9

What is the molar mass for Mg(CO3)

Chemistry
1 answer:
Dvinal [7]3 years ago
4 0

Answer: 84.32

Explanation: Just add the molar masses of all the elements: 1Mg, 1C, 3O

                                                                                           24.31 + 12.01 + (16.00*3)

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What mass of chromium (cr) is contained in 35.8 g of (nh4)2cr2o7 ?
fiasKO [112]
M{(NH₄)₂Cr₂O₇}=2A(N)+8A(H)+2A(Cr)+7A(O)

M{(NH₄)₂Cr₂O₇}=252.065 g/mol

M(Cr)=51.996 g/mol

m{(NH₄)₂Cr₂O₇}/M{(NH₄)₂Cr₂O₇}=m(Cr)/2M(Cr)

m(Cr)=2M(Cr)m{(NH₄)₂Cr₂O₇}/M{(NH₄)₂Cr₂O₇}

m(Cr)=2*51.996*35.8/252.065=14.770 g

m(Cr)=14.770 g
7 0
4 years ago
When 0.5141 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.823 °C to 29.419 °C
natka813 [3]

Answer:

\Delta_{r}U of the reaction is -6313 kJ/mol

\Delta_{r}H of the reaction is -6312 kJ/mol

Explanation:

Temperature\,\,change= \Delta U = 29.419-25.823 =3.506^{o}C

q_{cal}= C \times \Delta T

=5.861 \times 3.596 = 21.076\,kJ

q_{rxn}= -q_{cal}= -21.076\,kJ

\Delta_{r}U= -21.076 \times \frac{154}{0.5141}= -6313\, kJ/mol

Therefore, \Delta_{r}U of the reaction is -6313 kJ/mol.

The chemical reaction in bomb calorimeter  is as follows.

C_{12}H_{10}(s)+\frac{27}{2}O_{2}(g)\rightarrow 12CO_{2}(g)+5H_{2}O(g)

Number\,of\,moles\Delta n=(12+5)-\frac{27}{2}=3.5

\Delta_{r}H=\Delta E+ \Delta n. RT

=-6313+3.5\times 8.314\times 10^{-3} \times 3.596=-6312\,kJ/mol

Therefore, \Delta_{r}H of the reaction is -6312 kJ/mol.

3 0
3 years ago
Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction
gayaneshka [121]

Answer:

The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.

Explanation:

The mass of the reactants and products are equal and are not dependent on the physical state of the substances.

6 0
3 years ago
A 1 L container originally holds 0.4 mol of N2, 0.1 mol of O2, and 0.08 mole of NO. If the volume of the container holding the e
julsineya [31]

Answer:

a)  N_2=0.8mol/L

b)  O_2=0.2mol/L

c)  NO=0.16mol/L

Explanation:

From the question we are told that:

Moles 0f Nitrogen N_2=0.4

Moles 0f Oxygen O_2=0.1

Volume Decrease V_2=0.5L

Generally, the equation for Concentration is mathematically given by

C=\frac{moles}{V}

For Nitrogen

N_2=\frac{0.4}{0.5}

N_2=0.8mol/L

For Oxygen

O_2=\frac{0.1}{0.5}

O_2=0.2mol/L

For Nitrogen

NO=\frac{0.08}{0.5}

NO=0.16mol/L

3 0
3 years ago
What shows how much potential energy is in the water stored in hoover dam?
Inessa05 [86]
When it stays on top it has potential energy converted to mechanical energy because the turbines and rods are put to work. 
8 0
4 years ago
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