Of all boron atoms, 19.9%% are boron-10, which have a mass of 10.01294 amu. The other 80.1% of boron atoms are boron-11 and these have a mass of 11.00931. Calculate the average atomic mass of boron.

Answers

Answer 1

Answer:

Answer:

10.81 amu

Explanation:

The average atomic mass of Boron can be calculated as follows :

$A=19.9\%\ \text{of}\ 10.01294 +80.1\%\ \text{of}\ 11.00931\n\nA=(19.9)/(100)* 10.01294 +(80.1)/(100)* 11.00931\n\nA=10.81\ \text{amu}$

So, the average atomic mass of boron is 10.81 amu.

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The amount of silica in the magma and temperature are factors that determine the viscosity of magma.

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The molecular formula of glucose is C6H12O6. What is the empirical formula of glucose?(1) CHO (3) C6H12O6
(2) CH2O (4) C12H24O12

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Calcium reacts with water. This reaction is represented by the balanced equation below. The aqueous product of this reaction can be heated to evaporate the water, leaving a white solid, Ca(OH)2(s).Ca(s) + H2O(l) ==> Ca(OH)2(aq) + H2(g)

Compare the electrical conductivity of the aqueous product in the reaction to the electrical conductivity of the white solid that remains after the water is evaporated from the solution.

Write the chemical name of the base produced in the reaction.

State one change in reaction conditions that will increase the rate of the reaction.

Answers

Answer:

- Calcium is more conductive than calcium hydroxide.

- Calcium hydroxide.

- Addition of more either calcium or water to the reaction vessel

Explanation:

Hello,

In this case, based on the given reaction and information, calcium's electrical conductivity 0.298 106/(cm*Ω) which is a relatively high value compared to it its base has due to its large insolubility.

In addition, the name of the formed base is calcium hydroxide based on the IUPAC rules.

Moreover, the addition of more either calcium or water to the reaction vessel will generate more calcium hydroxide.

Best regards.

The aqueous product conducts electricity while the solid does not. Ionic solids do not conduct electricity, but ions dissolved in solution do.The chemical name of the base is calcium hydroxide.Increasing the temperature of the system would increase the rate of the reaction.

Is a haircut a physical or chemical change?

Answers

A haircut is physical because it just becomes shorter. Its chemical makeup is not altered.
Hope that helped you.

It's a physical because you have to actually do the work by using your hand to give a haircut

29 Which term identifies a type of nuclear reaction?(1) fermentation (3) reduction
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Answers

Answer:The correct answer is option (4).

Explanation:

Nuclear reaction :These the chemical reaction in which change in identity of a nucleus of an atom takes place.It is of two types:

Fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.
Fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

From the given options the option identifying the nuclear reaction is fission.Hence. the correct answer is option 4.

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Suppose you wanted to dissolve 106 g of Na2CO3 in enough H2O to make 6.00 L of solution.(1) What is the molar mass of Na2CO3? (2) What is the molarity of this solution?

Answers

The molarity of the solution is the ratio of moles of solute to the volume of the solution in L. The molar mass of sodium carbonate is 106 g/mol and molarity is 0.167 M.

What is molar mass?

Molar mass is the mass of the compound that is given by the addition of the atomic mass of the individual atom present in the compound with respect to their stoichiometry coefficients.

The molar mass (M) of sodium carbonate can be given as,

$\rm M(Na_(2)CO_(3)) = 2M(Na)+M(C)+3M(O)$

Here mass of sodium = 23, carbon = 12 and oxygen = 16

Substituting values of the atomic mass we get:

$\begin{aligned} &=2(23)+12+3(16)\n\n&=46+12+48\n\n&=106 \;\rm g/mol\end{aligned}$

Hence, the molar mass of sodium carbonate is 106 g/mol.

Now molarity of sodium carbonate can be estimated as:

$\begin{aligned}\rm Molarity &= \rm (mass)/(\rm molar \; mass * Volume)\n\n&= (106)/(106 * 6)\n\n&= 0.16 \;\rm M\end{aligned}$

Therefore, 106 g/mol is the molar mass and 0.16 M is the molarity of sodium carbonate.

Learn more about molar mass and molarity here:

brainly.com/question/1287789

M(Na2CO3)=2M(Na)+M(C)+3M(O)
=2(23)+12+3(16)
=46+12+48
=106 g/mol
the molar mass of Na2CO3 is 106 g/mol
m=106g M=106 g/mol n=m/M
n=m/M n=106/106 n=1mol

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