How many moles of H2SO4 are needed to prepare 200 mL of a 1.0 M solution?

Which ion has the largest radius? A. Se ^2- B. o ^2- C. Te^2- D.S^2-

lilavasa [31]

B) O^2-
Hope this helped :)

6 0

2 years ago

A gas that was cooled to 200 Kelvin has a volume of 65.8 L. If its initial volume was 132.4 L, what was its initial temperature?

Mandarinka [93]

Answer:

Initial temperature, T1 = 99.4 Kelvin

Explanation:

Given the following data;

Initial volume, V1 = 65.8 Litres
Final temperature, T2 = 200 Kelvin
Final volume, V2 = 132.4 Litres

To find the initial temperature (T1), we would use Charles' law;

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles' law is given by the formula;

$\frac {V}{T} = K$

$\frac {V_{1}}{T_{1}} = \frac {V_{2}}{T_{2}}$

Making T1 as the subject formula, we have;

$T_{1} = \frac {V_{1}T_{2}}{V_{2}}$

Substituting the values into the formula, we have;

$T_{1} = \frac {65.8 * 200}{132.4}$

$T_{1} = \frac {13160}{132.4}$

Initial temperature, T1 = 99.4 Kelvin

6 0

3 years ago

A chemical formula is an expression used to represent

Evgen [1.6K]

Answer:

A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements.

Explanation:

If only one atom of a specific type is present, no subscript is used. For atoms that have two or more of a specific type of atom present, a subscript is written after the symbol for that atom

8 0

3 years ago

Heat transfer by conduction occurs when

Stolb23 [73]

It is none of the three. Conduction occurs when a heat source directly is touching an object.

Explanation: Number 1 is convection. Key term: convection currents. Number 2 is radiation, as radiation can pass through space. Number 3 is just explaining a part of the convection current.

7 0

3 years ago

Read 2 more answers

8.98L of gas is collected at 32.8°C. Find the volume the gas will occupy at -19.9°C if the pressure remains constant.

Anuta_ua [19.1K]

Answer:

$\boxed{\text{2.47 L}}$

Explanation:

The pressure is constant, so, to calculate the volume, we can use Charles' Law.

$\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}$

Data:

V₁ = 2.98 L; T₁ = 32.8 °C

V₂ = ?; T₂ = -19.9 °C

Calculations:

(a) Convert temperatures to kelvins

T₁ = ( 32.8 + 273.15) K = 305.95 K

T₂ = (-19.9 + 273.15) K = 253.25 K

(b) Calculate the new volume

$\begin{array}{rcl}\dfrac{V_{1}}{T_{1}} &= &\dfrac{V_{2}}{T_{2}}\\\\\dfrac{2.98}{305.95} &= &\dfrac{V_{2}}{253.25}\\\\9.740 \times 10^{-3} &= &\dfrac{V_{2}}{253.25}\\\\{ V_{2}} &=& 9.740 \times 10^{-3} \times 253.25\\&=& \textbf{2.47 L}\\\end{array}\\\text{The gas will occupy $\large \boxed{\textbf{2.47 L}}$}$

4 0

3 years ago