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3 years ago

The molecular mass of a substance refers to the:

Chemistry

1 answer:

ololo11 [35]3 years ago

3 0

Answer:

Explanation:

it's the sum of the masses of all the atoms in the molecule

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How many moles of copper (Cu) are in 65.8 g Cu?

Veseljchak [2.6K]

<h2><u>Answer:</u></h2>

The correct answer is A) 1.04 mol Cu

{65.8 g / 63.55 g/mol}

= 1.04 mol Cu

Explanation:

In 63.55 g of copper metal there are 1 m o l of C u atoms. By dividing the mass of Cu and molar mass, we can easily get the number of moles.

5 0

3 years ago

Read 2 more answers

Help me pls I put 49 point( every single point that I have) pls help me

Aliun [14]

Answer:

Chemical reaction, compound, molecule, covalent bonds, ionic bonds, ions. (first page)

Oxygen and hydrogen, 1 hydrogen 2 oxygen, H2O, a covalent bond, then mark off is always a liquid. (Second page)

Explanation:

6 0

3 years ago

HELPPP PLS

photoshop1234 [79]

I think it could be C maybeee though

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3 years ago

Nitrogen monoxide, NO, reacts with hydrogen, H₂, according to the following equation.

Anvisha [2.4K]

Answer : The rate law for the overall reaction is, $Rate=k[NO]^2[H_2]$

Explanation :

Rate law : It is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

As we are given the mechanism for the reaction :

Step 1 : $2NO+H_2\rightarrow N_2+H_2O_2$ (slow)

Step 2 : $H_2O_2+H_2\rightarrow 2H_2O$ (fast)

Overall reaction : $2NO+2H_2\rightarrow N_2+2H_2O$

The rate law expression for overall reaction should be in terms of $NO\text{ and }H_2$ .

As we know that the slow step is the rate determining step. So,

The slow step reaction is,

$2NO+H_2\rightarrow N_2+H_2O_2$

The expression of rate law for this reaction will be,

$Rate=k[NO]^2[H_2]$

Hence, the rate law for the overall reaction is, $Rate=k[NO]^2[H_2]$

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3 years ago

Calculate the molar concentration of the Cl⁻ ions in 0.098 M MgCl2(aq).

SVETLANKA909090 [29]

MgCl2(aq) is an ionic compound which will have the releasing of 2 Cl⁻ ions ions in water for every molecule of MgCl2 that dissolves.
MgCl2(s) --> Mg+(aq) + 2 Cl⁻(aq)
[Cl⁻] = 0.098 mol MgCl2/1L × 2 mol Cl⁻ / 1 mol MgCl2 = 0.20 M
The answer to this question is [Cl⁻] = 0.20 M

6 0

3 years ago