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Deffense [45]
3 years ago
8

You decide to make a copper bracelet for your friend. In order to do this you need to heat 29.2g of copper from 25 C to 275 C. C

alculate the amount of heat te quieted feo this reaction to proceed.
Chemistry
1 answer:
motikmotik3 years ago
7 0

Answer:

Amount of heat required = 2810.5 J

Explanation:

Given data:

Mass of copper = 29.2 g

Initial temperature = 25°C

Final temperature = 275°C

Amount of heat required = ?

Solution:

Specific heat capacity of copper is 0.385 j/g.°C.

Formula:

Q = m×c×ΔT

ΔT = 275°C - 25°C

ΔT = 250°C

Q = 29.2 g × 0.385 j/g.°C ×250°C

Q = 2810.5 J

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Josie observed that when water is boiled in an open beaker it completely disappears, leaving the beaker dry. What can Josie conc
-BARSIC- [3]
That when water is boiled in a open beaker and it disappears that it evaporates into the air
6 0
4 years ago
How many grams are in 5.2 moles of Li2SO4
skelet666 [1.2K]

Answer:

572 g

Explanation:

Molar mass is the mass of 1 mol of an element or compound

molar mass of Li₂SO₄ is the sum of the products of the molar masses of the elements by the number of atoms in the compound

molar masses of each element making up lithium sulphate

Li - 7 g/mol

S - 32 g/mol

O - 16 g/mol

molar mass of Li₂SO₄ - (7 g/mol x 2) + ( 32 g/mol x 1) + ( 16 g/mol x 4 )

molar mass = 110 g/mol

mass of 1 mol of Li₂SO₄ is 110 g

therefore mass of 5.2 mol of Li₂SO₄ is - 110 g/mol x 5.2 mol = 572 g

mass is 572 g

7 0
3 years ago
Which of the following would dissolve in water?<br> CCl4<br> LiCl<br> CH4<br> PCl6
babymother [125]
Like dissolves like
so water is polar

CCl4 is nonpolar
LiCl is polar
CH4 is nonpolar
PCl6 is nonpolar

so LiCl would dissolve
7 0
3 years ago
Read 2 more answers
How many mL of a stock 50% (w/v) KNO3 solution are needed to prepare 250 mL of a 20% (w/v) KNO3 solution?
Andre45 [30]

Answer:

100ml of a stock 50% KNO3 solutions are needed to prepare 250ml of a 20% KNO3 solution.

Explanation:

In the given question it is mentioned that

     S1=50%

      V2=250ml

      S2= 20%

We all know that

                     V1S1=V2S2

                     ∴V1=  V2×S2÷S1

                     ∴V1=  V2S2×1/S1

                      ∴V1= 250×20÷50

                       ∴V1= 100ml

 

6 0
4 years ago
g Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no r
Mrac [35]

Answer:

CuBr₂(aq) + Pb(CH₃COO)₂(aq) → Cu(CH₃COO)₂(aq) + PbBr₂ (s)↓

Explanation:

We identify the reactants:

CuBr₂ and Pb(CH₃COO)₂

The products will be: Cu(CH₃COO)₂ and PbBr₂

You may know these information:

Salts from acetate are soluble.

Bromide can make solid salts with these cations: Ag⁺, Pb²⁺, Hg₂²⁺, Cu⁺

PbBr₂ is formed, so this will be our precipitate

The equation is:

CuBr₂(aq) + Pb(CH₃COO)₂(aq) → Cu(CH₃COO)₂(aq) + PbBr₂ (s)↓

8 0
3 years ago
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