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boyakko [2]
3 years ago
13

A construction worker uses a pulley and a rope to

Chemistry
1 answer:
Umnica [9.8K]3 years ago
3 0

Answer: Work is 1.7 kJ,  Power is 280 W

Explanation: Work  W = mgh, power P= W/t

W = 85 kg·9.81m/s²·2 m = 1667.7 J

P = 1667.7 J / 6 s = 277.95 W

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What is the volume, in liters, of 1.40 mol of oxygen gas at 20.0°C and 0.974 atm?
topjm [15]

Answer:

V = 34.55 L

Explanation:

Given that,

No of moles, n = 1.4

Temperature, T = 20°C = 20 + 273 = 293 K

Pressure, P = 0.974 atm

We need to find the volume of the gas. It can be calculated using Ideal gas equation which is :

PV=nRT

R is gas constant, R=0.08206\ L-atm/mol-K

Finding for V,

V=\dfrac{nRT}{P}\\\\V=\dfrac{1.4\times 0.08206\times 293}{0.974 }\\\\V=34.55\ L

So, the volume of the gas is 34.55 L.

4 0
3 years ago
HELP ASAP !!!!!!Can someone tell me easy one line definitions of atomic number, mass number, and isotopes
rusak2 [61]

Answer:

Fundamental properties of atoms including atomic number and atomic mass. The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons.

Explanation:

Fundamental properties of atoms including atomic number and atomic mass. The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons.

5 0
3 years ago
Indicate type of chemical reactions for 2Mgl2+MN(SO3)2=2MgSO3+Mnl4<br>​
Sever21 [200]

Answer:

double decomposition reaction

7 0
3 years ago
The formation of an ionic bond involves a number of different processes. in the formation of sodium chloride, represented by the
SCORPION-xisa [38]
Answer:
            The two steps which results in the release of energy are;

                 A)  Attraction of Na⁺ and Cl⁻<span> to form NaCl

                 C)  </span><span>The addition of an electron to each Cl atom

Explanation:
                   As we know<em> Born Haber Cycle </em>is helpful in measuring the Lattice Energies of Crystal systems indirectly. So, the formation of NaCl crystal takes place in several steps. Among all steps, The formation of Chloride ions (Electron Affinity) and binding of Na</span>⁺ and Cl⁻ (Lattice Energy) are exothermic in nature, while remaining all steps require energy to proceed (Endothermic).
5 0
3 years ago
Methane burns in oxygen to produce carbon dioxide and water. Which of the tollowing represents a preliminary, unbalanced equatio
WITCHER [35]

So first we need to know what the formulas are:

Methane: CH_{4}

Oxygen: O_{2}

Carbon Dioxide: CO_{2}

Water: H_{2}O

So then we follow the equation as specified in the question. Note that it does not need to be balanced, as the question states it wants the unbalanced equation:

CH_{4}+O_{2} → CO_{2}+H_{2}O

This is the preliminary, unbalanced equation with the correct chemical formulas.

4 0
3 years ago
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