An environmental chemist needs a carbonate buffer of pH 10.00. How many grams of Na,Co, must she add to 1.5 L of 0.20 M NaHCO,? K, of HCO, = 4.7 x 10"

The density of Argon gas at a pressure of 753 mmHg and a temperature of 35 °C is equal to 1.59 g/L.

What is the ideal gas equation?

The state of a quantity of gas is calculated by its pressure, volume, and temperature. The ideal gas law can be explained as the product of the volume and pressure of gas is equal to the multiplication of the universal gas constant and absolute temperature.

The mathematical equation for an ideal gas can be written as follows:

PV = nRT

PV =(m/M) RT

PM/RT = m/V

d = PM/RT

Where n is the moles of gas, T is the temperature of the gas,  V is the volume of the gas,  and R is the gas constant.

Given, the temperature of argon gas, T = 35 °C = 35 +273 = 308 K

The pressure of the argon gas, P = 753 mmHg = 1.01 atm

The molar mass of the Argon gas, M = 40 g/mol

Substitute  V, R, P, and T in the ideal gas equation, we get:

The density of Argon gas, d = PM/RT

d= 1.01 ×40/(0.082 × 308)

d = 1.59 g/L

Therefore, the density of Ar gas is 1.59 g/L.

Learn more about ideal gas equation, here:

brainly.com/question/3637553

#SPJ2

Substance A is mixed with water and donates 0.4% of its H⁺ ions, therefore given substance is a weak acid & show poor conduction of electric current.

What are acids?

According to the Arrhenius theory of acids and bases, acids are those species which gives H⁺ ion to the solution.

In the question it is given that, substance A is mixed with water and it donates H⁺ ion, from this it is clear that given substance is acid. It is also mention that it donates only 0.4% of its H⁺ ion means partial dissociation is observed, so we conclude that this acid is weak in nature. And due to weak dissociation and less number of available H⁺ ion it did not conduct electricity effectively.

Hence, option (D) is correct i.e. it is weak acid and a poor conductor of electric current.

To know more about acids, visit the below link:

brainly.com/question/12916250

Answer:

D

Explanation:

Explanation:

It is known that the atomic number of sodium is 11 and its electronic distribution is 2, 8, 1.

As the number of rows (called periods) in the periodic table represent the number of shells present in an element.

Since, sodium element have only two shells. Therefore, sodium lies in row 2 of the periodic table.

Also, the elements which contain same number of valence electrons lie in the same group.

Therefore, sodium belongs to group 1 and elements of the group 1 are also known as alkali metals.

Thus, we can conclude that in the periodic table sodium lies in period 2 and group 1.

The heat of combustion (Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions.

3.05988g. grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C.

What is meant by heat of combustion?

• The heat of combustion (Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions. In most cases, a hydrocarbon reacts with oxygen to produce carbon dioxide, water, and heat.
• The heat of combustion of a substance is the amount of energy released when a specific amount (e.g., 1 mol, 1g, 1 L) of the substance completely burns in oxygen. The heat of combustion is typically measured at 298K (25 C) and 101.3kPa.
• The energy released when a substance X completely burns with an excess of oxygen under standard conditions (25°C and 1 bar). It is the inverse of the enthalpy change for the combustion reaction in thermodynamic terms.

q=m*c*(change of T)

q=10000g(0.385J/g*c)*(65.0C-25.0C)or (338.2 K-298.2K)

q=154000J

154000J*(1 mol/2220 KJ)=69.36936 x mol

here's where I'm stuck

0.069369 mol

and i know that for every 1 mol there is 44.11g of C3H8.

0.069369 mol* (44.11g C3H8)/1mol = 3.05988g.

To learn more about : Heat of combustion

Ref : brainly.com/question/25109613

#SPJ2

Answer:

Explanation:

q = (mass) (temp change) (specific heat)

q = (10000 g) (40 °C) (0.385 J/g⋅°C) = 154000 J = 154 kJ

154 kJ / 2220 kJ/mol = 0.069369369 mol

0.069369369 mol times 44.0962 g/mol = 3.06 g (to three sig figs)

answer choice 4

Answer:  magnesium chloride

Explanation: Magnesium chloride is an ionic compound which is formed by combination of and ions.

The name of the ionic compound is written as follows:

The name of the metal is written first followed by the name of the non metal without any prefix but the name of the non metal ends with ide, ite, ate or ite.

Thus the name of is magnesium chloride.