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3 years ago

A zinc block with a mass of 230 g is given 1320 J of energy. What is the change in

Chemistry

1 answer:

Mariana [72]3 years ago

4 0

Answer:

14.7°C

Explanation:

Q = m·ΔT·c

ΔT = $\frac{Q}{m*c}$

ΔT = $\frac{1320 J}{230 g* 0.39 J/gC}$

= 1320 J / ((230 g) * (.39 J/g°C)

ΔT = 14.7 °C

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Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an el

Alexxandr [17]

Answer: 530 hours

Explanation:

The reduction of Nickel ions to nickel is shown as:

$Ni^{2+}+2e^-\rightarrow Ni$

$96500\times 2=193000Coloumb$ of electricity deposits 1 mole of Nickel

1 mole of Nickel weighs = 58.7 g

Given quantity = 18.0 kg = 18000 g (1kg=1000g)

58.7 g of Nickel is deposited by 193000 C of electricity

18000 g of Nickel is deposited by = $\frac{193000}{58.7}\times 18000=59182282.8C$ of electricity

$Q=I\times t$

where Q= quantity of electricity in coloumbs = 59182282.8C

I = current in amperes = 31.0 A

t= time in seconds = ?

$59182282.8C=31.0A\times t$

$t=1909105.9sec$

(1h=3600 sec)

$t=530hours$

Thus 530 hours are required to plate 18.0 kg of nickel onto the cathode if the current passed through the cell is held constant at 31.0 A

3 0

3 years ago

Im hella confused and need some help

tatiyna

An oxide is a molecule that has 2 Oxygen atoms in its empirical formula. Stoichiometry would be used as the ratio of Oxygen to Dioxides is 3:2. So 52.29 would be multiplied by 3/2. The answer is 78.435 Mol of CO2 are formed.

6 0

3 years ago

Given 50g of sodium how many moles do you have?

Anastaziya [24]

Answer:

Amount of Na = 2.17moles

Explanation:

Mass of Na = 50g

Molar mass of Na = 23g/mol

Amount of mole = mass/molar mass

Amount of mole = 50/23

Amount of mole = 2.17moles

5 0

3 years ago

The best electrolyte solutions are A. dilute B. concentrated C. saturated

Rudiy27

The correct answer is A.) dilute

8 0

3 years ago

How many moles of atoms are contained in 15.7 g of Bromine

Vlada [557]

1 mol of Br = 79.9 g

15.7 g / 79.9 g = 0.196 moles of atoms

3 0

3 years ago