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Iteru [2.4K]
3 years ago
5

Calculate AHræn for the following reaction

Chemistry
1 answer:
HACTEHA [7]3 years ago
8 0

Answer:

60ax 70by 67ay ah251

Explanation:

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a dextrose solution with a mass of 2.00 x 102g has 15.8 g of dextrose dissolved in it. what is the mass percent concentration of
yulyashka [42]

Answer:

7.9%

Explanation:

2x10^2=200g

15.8g

15.8/200x100g

15.8/2

7.9%

5 0
3 years ago
Thomson's plum pudding model of the atom was most directly replaced or refuted by
andriy [413]

Answer:

A. Rutherford's discovery that atoms contain a nucleus

Explanation:

7 0
3 years ago
Read 2 more answers
What is the molarity of a solution made with 400 grams of copper II chloride in 3.5 liters of water?
Leni [432]

Answer:

0.85M

Explanation:

Given parameters:

Mass of CuCl₂  = 400g

Volume of water  = 3.5L

Unknown:

Molarity of the solution = ?

Solution:

Molarity is one of the ways of expressing the concentrations of a solution. It is defined as the number of moles per unit volume of a solvent.

          Molarity  = \frac{number of moles}{volume}

To find the number of moles of CuCl₂;

    Number of moles  = \frac{mass}{molar mass}

  Molar mass of CuCl₂ = 63.6 + 2(35.5)  = 134.6g/mol

   Number of moles  = \frac{400}{134.6}   = 2.97moles

      Molarity  = \frac{2.97}{3.5}    = 0.85M

4 0
3 years ago
A 10g sample of water at 283K releases 42 joules of heat energy. How many degrees Kelvin is the final temperature of the water.
Ksivusya [100]
Did you figure it out?
6 0
3 years ago
Magnesium oxide forms from magnesium metal and oxygen gas O2. Write a word equation and an unbalanced formula including physical
sergiy2304 [10]

Answer:

See explanation

Explanation:

The word equation is just a statement of the reaction in words as follows;

Magnesium oxide ----> Magnesium metal + oxygen gas

An unbalanced stoichiometric equation doesn't have equal number of atoms of each element on both sides.

Hence the unbalanced stoichiometric equation is as follows;

MgO(s) -----> Mg(s) + O2(g)

5 0
3 years ago
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