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3 years ago

How many moles are in 2.5g of n2

Chemistry

2 answers:

exis [7]3 years ago

7 0

n= m/M = 2.5/14 = 5/28 mol

ok done. thank to me :>

Thepotemich [5.8K]3 years ago

6 0

Answer:

0.089

Explanation:

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Enter a chemical equation for NaOH(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that

yuradex [85]

Answer:

NaOH(aq) is a Base.

Explanation:

Those substances which give or release $OH^{-}$ ions in aqueous solution are called as the Arrhenius Bases.

In the aqueous solution, NaOH dissociates as follows -

$NaOH^{}$ ↔ $Na^{+} + OH^{-}$

If it reacts with a strong acid HCl, the chemical equation for this reaction will be as follows -

$HCl + NaOH = NaCl + H_{2} O$

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3 years ago

What Kelvin temperature is the same as -13° Celsius?

zavuch27 [327]

Answer:

Degrees Kelvin = Degrees Celsius + 273.15

Degrees Kelvin = -13 + 273.15

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Explanation:

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3 years ago

Describe the method to make pure, dry crystals of magnesium sulfate from a metal oxide and dilute acid.

emmasim [6.3K]

Answer:

H2SO4(aq) + MgO(s) → H2O(l) + MgSO4(aq)

Explanation:

We must recall that the oxides of metals are bases. These metal oxides can react with dilute acids to yield salt and water.

Bearing that in mind, we want to obtain magnesium sulfate from a metal oxide and dilute acid.

In this case we need magnesium oxide and dilute sulphuric acid. The reaction occurs as follows;

H2SO4(aq) + MgO(s) → H2O(l) + MgSO4(aq)

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3 years ago

What does it mean to be an exothermic chemical reaction? a) Energy is released when no new substances are made. b) Energy is rel

mario62 [17]

Answer:b

Explanation:

Energy is released to form the product

3 0

3 years ago

What is the molarity of 60.0 grams of NaOH dissolved in 750 milliliters of water?

Bumek [7]

Answer:

The correct answer option is B) 2.0 M.

Explanation:

We are given the number of grams of NaOH (Sodium Chloride) which are dissolved in 750 milliliters of water and we are to find its molarity.

We know the formula of molarity:

Molarity = (mass * 1000) / (volume * molecular mass)

Volume = 750 ml = 750 cm $^3$

Molecular mass = 40

Mass = 60 grams

Substituting these values in the above formula:

Molarity = $\frac{(60*1000)}{750*40}$ = 2.0 M

8 0

3 years ago