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Grace [21]
2 years ago
9

Solid zinc oxide (ZnO) is added to hydrochloric acid (HCl) to form zinc chloride (ZnCl2) in water (H2O). How many moles of zinc

chloride (ZnCl2) will be produced when 112 grams of zinc oxide (ZnO) is used?
ZnO + 2HCl --> ZnCl2 + H2O
Chemistry
1 answer:
yarga [219]2 years ago
7 0

Answer:

1.376 moles ZnCl₂

Explanation:

Based on the reaction:

ZnO + 2HCl → ZnCl₂ + H₂O

<em>1 mole of ZnO reacts with 2 moles of HCl to produce 1 mole of ZnCl₂.</em>

To solve this question we need to convert the mass of ZnO to moles using its molar mass (ZnO = 81.38g/mol). The moles of ZnO added are the moles of ZnCl₂ produced (1mole of ZnO produce 1 mole of ZnCl₂):

<em>Moles ZnO = Moles ZnCl₂:</em>

112g ZnO * (1mol / 81.38g) = 1.376 moles ZnCl₂

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Heat flows from the coffee to the spoon through conduction

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A 50.0 mL sample of an aqueous H2SO4 solution is titrated with a 0.375 M NaOH solution. The equivalence point is reached with 62
vesna_86 [32]

Answer: The concentration of H_2SO_4 is 0.234 M

Explanation:

According to the neutralization law,

n_1M_1V_1=n_2M_2V_2

where,

n_1 = basicity H_2SO_4 = 2

M_1 = molarity of H_2SO_4 solution = ?

V_1 = volume of  H_2SO_4 solution = 50.0 ml

n_2 = acidity of NaOH = 1

M_1 = molarity of NaOH solution = 0.375 M

V_1 = volume of  NaOH solution = 62.5 ml

Putting in the values we get:

2\times M_1\times 50.0=1\times 0.375\times 62.5

M_1=0.234M

Therefore concentration of H_2SO_4 is 0.234 M

6 0
2 years ago
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2 years ago
In a Dam, If we doubled the depth of the dam the hydrostatic force will be ?
AnnZ [28]

Answer: Option (A) is the correct answer.

Explanation:

Force acting on a dam is as follows.

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Now, when we double the depth then it means H is increasing 2 times and then the above relation will be as follows.

                F' = \frac{1}{2}\rho g\omega (2)^{2}

               F' = \frac{1}{2}\rho g\omega 4 ........... (2)

Now, dividing equation (1) by equation (2) as follows.

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Cancelling the common terms we get the following.

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Thus, we can conclude that if doubled the depth of the dam the hydrostatic force will be 4F.

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2 years ago
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