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3 years ago

When hydrogen nuclei are fused together to form a helium nucleus, the mass of the product is 0.7% less than the mass of

Chemistry

1 answer:

WITCHER [35]3 years ago

4 0

U should try Chegg to be honest dats how I got through chemistry

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A student determines that the theoretical yield of CaCO3, from a precipitation reaction is 21.5 grams

Semenov [28]

Answer:

92.6

Explanation:

8 0

3 years ago

For something to be considered a polar bond, what does the electronegativity difference have to be at a minimum?

kondor19780726 [428]

Answer: A bond in which the electromagnetically difference between the atoms is between 0.4 and 1.7 is called a polar covalent bond.

Explanation:

There you go.... your welcome

4 0

3 years ago

How do u get the formulae for sodium oxide

Maslowich

Answer:

The Chemical formula of sodium is Na.

The Chemical formula of oxide is O.

Explanation:

Therefore we know that the term 'valency' is called as the combining capacity of an atom of an element.

So by taking the valency of Sodium and Oxide, we get

Sodium with valency '1' and Oxide with valency '2'.

Na O

1 2

When you cross over you get 'Na2O' as the formula for sodium oxide.

Hope this is helpful for you!

Don't forget to rate or give brainliest answer.!!

TY.

5 0

3 years ago

Read 2 more answers

Genetic material (_____) is passed from cell to cell.

Setler [38]

Answer:

DNA

Explanation:

4 0

3 years ago

Part a cyclohexane has a freezing point of 6.50 ∘c and a kf of 20.0 ∘c/m. What is the freezing point of a solution made by disso

Andrei [34K]

The mathematical expression for the depression in freezing point is given as:

$\Delta T_{f}= k_{f}m$

where, $\Delta T_{f}$ = depression in freezing point

$k_{f}$ = molal depression constant (20.0 $^{o}Ckg/mole$ )

m = molality

Molality is defined as the ratio of number of moles of solute to the kg of the solvent

Number of moles = $\frac{given mass in g}{molar mass}$

given mass of biphenyl solute = 0.925 g

Molar mass of biphenyl = 154.21 g/mol

Put the values,

number of moles of biphenyl = $\frac{0.925 g}{154.21 g/mol}$

= $0.0059 mole$

Molality = $\frac{number of moles of biphenyl solute}{mass of the solvent in kg}$

Mass of cyclohexane solvent = 25.0 g

Convert g into kg: 1 kg = 1000 g

Thus, mass of cyclohexane = $\frac{25.0}{1000}$

= 0.025 kg

Now, put the values in the formula of molality:

Molality = $\frac{0.0059 mole}{0.025 kg}$

= 0.236 mole/kg or 0.236 m.

Calculate the depression in freezing point:

$\Delta T_{f}= 20.0^{o}C kg/mole\times 0.236 mole/kg$

= $4.72 ^{o}C$

Now, $\Delta T_{f} = T_{solvent} - T_{solution}$

$4.72 ^{o}C = 6.50^{o}C - T_{solution}$

$T_{solution} = 6.50^{o}C- 4.72 ^{o}C$

= $1.78^{o}C$

Hence, freezing point of the solution is $1.78^{o}C$ .

4 0

3 years ago

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