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2 years ago

Which of the following of the following is the same for both hydrogen and potassium ?

1 answer:

Alex2 years ago

3 0

The answer is C. number of valence electrons. see, both pottassium and hydrogen are in group one and the group they are in shows the amount of valence electrons. hope this helped you

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Please help

Sauron [17]

Answer:

D) is the answer please thanks

6 0

1 year ago

When 15.3 g of sodium nitrate, NaNO3,was dissolved in water in a calorimeter, the temperature fell from 25.00oC to 21.56oC. If t

satela [25.4K]

Answer:

20.468 kilo Joules is the enthalpy change when one mole of sodium nitrate dissolves.

Explanation:

Heat lost by solution ad calorimeter = Q

Heat capacity of solution ad calorimeter = C = 1071 J/°C

Change in temperature = ΔT = 21.56°C - 25.00°C = -3.44°C

$Q=C\times Delta T$

$Q=1071 J/^oC\times (-3.44^oC)=-3,684.24 J$

Heat gained by sodium nitrate = -Q = -(-3,684.24 J)=3,684.24 J

Moles of sodium nitrate = $\frac{15.3 g}{85 g/mol}=0.18 mol$

When 0.18 mole of sodium nitrate was dissolved in water 3,684.24 joulesof heat was absorbed by it.

Then heat absorbed by 1 mole of sodium nitrate :

$\frac{3,684.24 J}{0.18}=20,468 J=20.468 kJ$

1 J = 0.001 kJ

20.468 kilo Joules is the enthalpy change when one mole of sodium nitrate dissolves.

8 0

2 years ago

When swimmers push against the wall of a pool with their feet, they are pushed away from the wall. Which of Newton's laws explai

Alecsey [184]

It would be his third law

8 0

2 years ago

How many moles are in 428 L of chlorine gas

djyliett [7]

Answer:

19.3 moles

Explanation:

In order to calculate the number of moles of Chlorine gas from the volume, we have to calculate its mass from its known density using the formula:

Density (g/L) = mass (g) /volume (L)

Density of Chlorine gas= 3.2g/L

Volume = 428L

3.2 = mass/428

mass = 428 × 3.2

mass = 1369.6g

Using mole = mass ÷ molar mass

Molar mass of chlorine (Cl2) = 35.5 × 2

= 71g/mol

mole = 1369.6 ÷ 71

mole = 19.2901

mole = 19.3 moles

6 0

2 years ago

Please help!!

liraira [26]

This is one of the explanations I could think of,

Many reactions are incomplete and the reactants are not completely converted to products. Understandably due to loss in the process or inefficiency of the chemical reaction

6 0

3 years ago

Read 2 more answers