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Usimov [2.4K]
2 years ago
14

Which of the following substances has the characteristics shown in the chart? A. homogeneous mixture B. compound C. solution D.

heterogeneous mixture
Chemistry
1 answer:
notsponge [240]2 years ago
6 0
Lol I need help on this too
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5<br> - HCN +<br> CuSO4 →<br> Type of reaction
lesya692 [45]

Answer:

CuSO_{4}+2HCN\rightarrow Cu(CN)_{2}+H_{2}SO_{4}

Explanation:

The valancy of Cu = +2

SO4 = -2

CN = -1

H =+1

So when HCN and CuSO4 react Cu(CN)2 and H2SO4 are formed.

Cu(CN)2 formation :

2 CN = 2 x -1  = -2

Its should attach to +2 charge atom which is Cu

So 1 Cu and 2 CN = Cu(CN)2

Similary,

H2SO4 formation:

SO4 = -2 charge

It require +2 charge so need two H+

2 H = 2x1 = +2 charge

Hence , 1 SO4 and 2 H combine to form H2SO4

<u><em>Law of conservation of mass:</em></u><em> It states that mass can neither be created nor destroyed during a chemical reaction.</em>

<em>Total mass of the reactant must be equal to total mass of product.</em>

<u>Only those equations are balanced which follows law of conservation of mass </u>

Count total number of atoms in the reactant and product .

The number of atoms in the product = The number of atoms in the reactant

In the given equation:

CuSO_{4}+2HCN\rightarrow Cu(CN)_{2}+H_{2}SO_{4}

Reactant are 2HCN and CuSO4

atoms of H = 1x2=2 , C=1x2=2  , N=1x2=2 , Cu = 1, S = 1 ,O =4

Products: Cu(CN)2 and H2SO4

atoms of H =2 , S=1 , O=4 ,C = 2x1=2 , N = 2x1 =2 , Cu = 1

Hence this is balance equation

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alukav5142 [94]
N2 + 3 H2 -> 2 NH3 
<span>Just use their stoichiometric coefficients (number before the chemical's name) from the balanced chemical reaction to make ratios and solve for the unknown. In this case, 2 moles of NH3 are produced for every 3 moles of H2. Thus, </span>
<span>7.5 moles H2 x (2 moles NH3 / 3 moles H2) = 5 moles NH3 
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