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3 years ago

Which best describe the isovolumetric contraction phase of the cardiac cycle?

2 answers:

5 0

The name isovolumetric indicates that there is no change in volume that takes place and this only occurs when all of the valves within the heart are shut.

Zina [86]3 years ago

4 0

Isovolumentric contraction phase of the cardiac cycle is the stage at which isovolumentric contraction occurs, at this phase all of the four valves of the heart are closed.

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How much heat is absorbed/released when 20.00 g of NH3(g) reacts in the presence of excess O2 (g) to produce NO (g) and H2O (l)

FrozenT [24]

Answer:

a. 342.9 kJ of heat are absorbed.

Explanation:

Calculation of the moles of $NH_3$ as:-

Mass = 20.00 g

Molar mass of $NH_3$ = 17.031 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{20.00\ g}{17.031\ g/mol}$

$Moles= 1.1743\ mol$

Given that:- $\Delta H=+1168\ kJ$

It means that 1 mole of $NH_3$ undergoes reaction and absorbs 1168\ kJ of heat

So,

1168 mole of $NH_3$ undergoes reaction and absorbs $1168\times 1168\ kJ$ of heat

Amount of heat absorbed = + 342.9 KJ

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3 years ago

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alexandr1967 [171]

Calcitriol is the active form of vitamin D. (D)

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3 years ago

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What is the percent of oxygen by mass in C2H402

Rom4ik [11]

Answer:

53.3 %.

Explanation: C2H4O2. = 2 * 12.011 + 4 * 1.008 + 2 * 15.999. = 60.052.

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3 years ago

Emily floats a note across a river to Dylan instead of directly passing it from her hand to Dylan's hand. If, in this scenario,

slega [8]

Answer: The Note

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Wewaii [24]

Answer:

Explanation:

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3 years ago