Answer:
0.036 moles of gas are contained in 890.0 mL at 21.0 C and 0.987 atm
Explanation:
Ideal gases are those gases whose molecules do not interact with each other and move randomly.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
where P represents the pressure of the gas, V its volume, n the number of moles of gas (which must remain constant), R the constant of the gases and T the temperature of the gas.
In this case:
- P= 0.987 atm
- V= 890 mL= 0.890 L (being 1 L= 1,000 mL)
- n= ?
- R= 0.082
- T= 21 °C= 294 °K
Replacing:
0.987 atm* 0.890 L= n* 0.082 * 294 K
Solving:
n= 0.036 moles
<u><em>0.036 moles of gas are contained in 890.0 mL at 21.0 C and 0.987 atm</em></u>
CaCO3 <span>→</span> CaO + CO<span>2
</span>H2CO3 →<span> H</span>2O<span> + CO</span>2<span>
</span>
<span>8Fe + S8 --> 8FeS
it is </span>
<span>A) synthesis
proof
A +B----->AB
reactants product
it is </span><span>chemical synthesis reaction</span>
Answer:
Excretory system, and Kidney.
Explanation:
The excretory system helps to regulate the chemical composition of the body fluids by removing metabolic waste such as undigested food, intestinal bacteria, and old cells and helping to retain the proper amount of water, nutrients, and salts in the body.
The main function of the kidney is to filter the blood, kidney help to remove waste from the body as urine, control fluid balance in the body, and keep the right level of electrolytes. Each kidney is bean-shaped in structure and 4-5 inches long in size.
Answer:
PI = 6.04
In the attached figure are the missing hydrogen atoms
Explanation:
Given both pk, the isoelectric point will be equal to:
PI = (1/2)*(pka + pka2), where pka = 2.32 and pka2 = 9.76
PI = (1/2)*(2.32 + 9.76) = 6.04
