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crimeas [40]
3 years ago
6

CHEM QUESTION

Chemistry
2 answers:
Maksim231197 [3]3 years ago
8 0

Answer:

B. \displaystyle The\:"missing"\:mass\:has\:been\:converted\:to\:energy.

Explanation:

If you have not notised, the mass is the products are <em>less than </em>the mass of the reactants. The mass is reduced after the conversion. This decrease indicates that the mass had to be somewhere because the mass would probably have been <em>equal</em>, or <em>greater than</em> the mass of the reactants if it had been mass. This is accurate because all the data that should be correct are provided by the query. Essentially, the question decides all for you.

I am joyous to assist you anytime.

aalyn [17]3 years ago
8 0
B. The “missing” mass has been converted to energy.
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How many ions are present in 75.0g of magnesium sulfate
Ostrovityanka [42]

Answer:

7.5×10²³ ions

Explanation:

Given data:

Mass of magnesium sulfate = 75.0 g

Number of ions = ?

Solution:

Number of moles of magnesium sulfate:

Number of moles = mass/molar mass

Number of moles = 75.0 g/ 120.36 g/mol

Number of moles = 0.623 mol

Magnesium sulfate formula: MgSO₄

Number of moles of ions in 1 mole of MgSO₄ = 2 mol (Mg²⁺ and SO₄²⁻)

Number of moles of ion in 0.623 moles of MgSO₄:

2 mole ×0.623 = 1.246 mol

Number of ions:

1 mole contain 6.022×10²³ ions

1.246 mol × 6.022×10²³ ions / 1mol

7.5×10²³ ions

4 0
3 years ago
Calculate the change in temperature that occurs when 3.50 x 10^-2kg of copper heated by 635 J of energy. Ccu = 0.385 j/gxC
vovikov84 [41]

Answer:

The change in T° is 47.1 °C

Explanation:

Calorimetry formula to solve this:

Q = m . C . ΔT

We replace the data gien:

635 J = 3.50×10⁻² kg . 0.385 J/g°C . ΔT

In units of C, we have g and the mass (m) is in kg. So let's convert it from kg to g → 3.50×10⁻² kg . 1000 g / 1kg = 35 g. Now we can determine the ΔT:

635 J = 35 g . 0.385 J/g°C . ΔT

635 J / 35 g . 0.385 J/g°C = ΔT

47.1°C = ΔT

6 0
3 years ago
Read 2 more answers
True or false: The force exerted onto an object must be perpendicular to the displacement if work is to be considered done.
RUDIKE [14]

Answer:

its letter B. false

Explanation:

bjchakfbhc

4 0
3 years ago
If the concentration of products is increased the equilibrium is shifted from * left to right/ to the left/ right to left /down
Marysya12 [62]

Answer:

to the left

Explanation:

<u>If the concentration of products is increased for a reaction that is in equilibrium, the equilibrium would shift to the left side of the reaction (the reactant's side). </u>

For a reaction that is in equilibrium, the reaction is balanced between the reactants and the products. According to Le Cha telier's  principle, if one of the constraints capable of influencing the rate of reactions is applied to such a reaction that is in equilibrium, the equilibrium would shift so as to neutralize the effects created by the constraint.

<em>Hence, in this case, if the concentration of the products of a reaction in equilibrium is increased, the equilibrium would shift in such a way that more reactants are formed so as to annul the effects created by the increase in the concentration of the products. Since reactants are always on the left side of chemical equations, it thus means that the equilibrium would shift to the left.</em>

5 0
3 years ago
Calculate the final temperature when 50 ml of water at 65 are added to 25 ml of water at 25
Sonja [21]
61.7 degrees celsius

8 0
4 years ago
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