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Alisiya [41]
3 years ago
15

Which formula represents the compound commonly known as phosphine PH PH2 PH3 PH4

Chemistry
2 answers:
deff fn [24]3 years ago
8 0
"PH3" is the one formula among the following choices given in the question that <span>represents the compound commonly known as phosphine. The correct option among all the options that are given in the question is the third option or the penultimate option. I hope that this is the answer that has come to your help.</span>
AveGali [126]3 years ago
4 0
The answer is C). PH3
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A student is trying to develop a model of an instant heat pack. What is the essential characteristic of the chemical reaction th
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The standard enthalpy of reaction should be negative.

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3 0
2 years ago
12oz of water initially at 75oF is mixed with 20oz of water intiially at 140oF. What is the final temperature?
Kaylis [27]

Answer:

115.625^{\circ}\text{F}

Explanation:

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m_2 = Second mass of water = 20 oz

\Delta T_1 = Temperature difference of the solution with respect to the first mass of water = (T-75)^{\circ}\text{F}

\Delta T_2 = Temperature difference of the solution with respect to the second mass of water = (T-75)^{\circ}\text{F}

c = Specific heat of water

As heat gain and loss in the system is equal we have

m_1c\Delta T_1=m_2c\Delta T_2\\\Rightarrow m_1\Delta T_1=m_2\Delta T_2\\\Rightarrow 12(T-75)=20(140-T)\\\Rightarrow 12T-900=2800-20T\\\Rightarrow 12T+20T=2800+900\\\Rightarrow 32T=3700\\\Rightarrow T=\dfrac{3700}{32}\\\Rightarrow T=115.625^{\circ}\text{F}

The final temperature of the solution is 115.625^{\circ}\text{F}.

3 0
2 years ago
Identify and describe atom, element, compound and molecule of important in food science​
Y_Kistochka [10]

Answer:

an atom is the smallest particle of matter

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