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irga5000 [103]
3 years ago
8

A

Chemistry
2 answers:
dedylja [7]3 years ago
4 0

Answer:

the asnwer would be 67 and 45

Explanation: fvjgr ngvrtje

insens350 [35]3 years ago
4 0

Answer:

The answer would be 2.58 L

Explanation:

For every cm cubed it is 1mL. So when you’re doing your conversions don’t forget that rule. You need to cancel everything out except the Liters. Convert cm cubed to mL and convert mL to Liters

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How does a chemical reaction change one substance into another?
sleet_krkn [62]

Answer:

Explanation:

By rearrangement of atoms of reactants. The entire properties will also different from the reactants as the composition changes.

5 0
3 years ago
) B5H9(l) is a colorless liquid that will explode when exposed to oxygen. How much heat is released when 0.211 mol of B5H9 react
Tom [10]

<u>Answer:</u> The amount of heat released when 0.211 moles of B_5H_9(l) reacts is 554.8 kJ

<u>Explanation:</u>

The chemical equation for the reaction of B_5H_9 with oxygen gas follows:

2B_5H_9(l)+12O_2(g)\rightarrow 5B_2O_3(s)+9H_2O(l)

The equation for the enthalpy change of the above reaction is:

\Delta H_{rxn}=[(5\times \Delta H_f_{(B_2O_3(s))})+(9\times \Delta H_f_{(H_2O(l))})]-[(2\times \Delta H_f_{(B_5H_9(l))})+(12\times \Delta H_f_{(O_2(g))})]

We are given:

\Delta H_f_{(H_2O(l))}=-285.4kJ/mol\\\Delta H_f_{(B_2O_3(s))}=-1272kJ/mol\\\Delta H_f_{(B_5H_9(l))}=73.2kJ/mol\\\Delta H_f_{(O_2(g))}=0kJ/mol

Putting values in above equation, we get:

\Delta H_{rxn}=[(2\times (-1272))+(9\times (-285.4))]-[(2\times (73.2))+(12\times (0))]\\\\\Delta H_{rxn}=-5259kJ

To calculate the amount of heat released for the given amount of B_5H_9(l), we use unitary method, we get:

When 2 moles of B_5H_9(l) reacts, the amount of heat released is 5259 kJ

So, when 0.211 moles of B_5H_9(l) will react, the amount of heat released will be = \frac{5259}{2}\times 0.211=554.8kJ

Hence, the amount of heat released when 0.211 moles of B_5H_9(l) reacts is 554.8 kJ

7 0
3 years ago
Wing practice problems:
Gnom [1K]

Answer:

g x 334 J/g = 3340J or 3.34kJ.

Explanation:

6 0
3 years ago
Which statement describes a chemical property of gasoline?
Norma-Jean [14]
The answer will be B
8 0
3 years ago
Read 2 more answers
Calculate the energy required to heat of 1.50 kg silver from -7.8 C to 15.0 C . Assume the specific heat capacity of silver unde
Aloiza [94]

Answer:

804 J

Explanation:

Step 1: Given data

  • Mass of silver (m): 1.50 kg
  • Initial temperature: -7.8 °C
  • Final temperature: 15.0 °C
  • Specific heat capacity of silver (c): 0.0235J·g⁻¹K⁻¹

Step 2: Calculate the energy required (Q)

We will use the following expression.

Q = c × m × ΔT

Q = 0.0235J·g⁻¹K⁻¹ × (1.50 × 10³g) × [15.0°C-(-7.8°C)]

Q = 804 J

5 0
3 years ago
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