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4 years ago

If the Sun and volcanoes were controlling the climate, the climate would

Chemistry

1 answer:

pav-90 [236]4 years ago

4 0

Answer:

undergo global warming at a faster rate than what we are seeing currently

Explanation:

because sun and volcanoes are the hottest things so it would undergo global warming at a faster rate.

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Not yet answered Marked out of 2.00 What is the concentration of NH4+ in 60.0 mL of a 0.50 M solution of (NH4)3PO4? (To write yo

Softa [21]

Answer : The concentration of $NH_4^+$ ion is $0.15E^1M$

Explanation :

First we have to calculate the moles of $(NH_4)_3PO_4$ .

$\text{Moles of }(NH_4)_3PO_4=\text{Concentration of }(NH_4)_3PO_4\times \text{Volume of solution}=0.50M\times 0.06L=0.03mole$

The balanced chemical reaction will be:

$(NH_4)_3PO_4\rightleftharpoons 3NH_4^++PO_4^{3-}$

From the reaction we conclude that,

1 mole of $(NH_4)_3PO_4$ dissociate to give 3 moles of $NH_4^+$ ion and 1 mole of $PO_4^{3-}$ ion

So,

0.03 mole of $(NH_4)_3PO_4$ dissociate to give $3\times 0.03=0.09$ moles of $NH_4^+$ ion and 0.03 mole of $PO_4^{3-}$ ion

Now we have to calculate the concentration of $NH_4^+$ ion.

$\text{Concentration of }NH_4^+=\frac{\text{Moles of }NH_4^+}{\text{Total volume}}$

$\text{Concentration of }NH_4^+=\frac{0.09mole}{0.06L}=1.5M=0.15E^1M$

Therefore, the concentration of $NH_4^+$ ion is $0.15E^1M$

4 0

4 years ago

Which statement is true regarding a catalyst?

Alla [95]

Answer:

d). A catalyst lowers the activation energy for a chemical reaction.

Explanation:

From the given choices, it is true that a catalyst lowers the activation energy for a chemical reaction.

The activation energy is the energy barrier that must be overcome before a chemical reaction can occur.

Some reactions have very high activation energy and would not occur without the introduction of a catalyst.

The catalyst brings the reactants into contact by removing the energy deficiency in the system.

4 0

3 years ago

Read the given equation. 2Na + 2H2O → 2NaOH + H2

Crank

Answer:

B) 12.9 grams.

Explanation:

How many moles of molecules in that 6.30 L of H₂?

The volume of one mole of an ideal gas at STP (0 °C, 1 atm) is 22.4 liters.

(The volume of that one mole of gas at STP will be 22.7 liters if STP is defined as 0 °C and 10⁵ Pa).

$\displaystyle n(\text{H}_2) = \frac{6.30\;\text{L}}{22.4\;\text{L}\cdot\text{mol}^{-1}} = 0.28125\;\text{mol}$ .

How many moles of Na will be needed?

The coefficient in front of Na in the equation is twice the coefficient in front of H₂. It takes two moles of Na to produce one mole of H₂.

$n(\text{Na}) = 2\;n(\text{H}_2) = 2\times 0.28125= 0.5625\;\text{mol}$ .

What's the mass of that many Na atoms?

Refer to a modern periodic table. The molar mass of ₁₁Na is 22.990. The mass of one mole of Na atoms is 22.990 gram. The mass of 0.5625 moles of Na atoms will be

$m = n\cdot M = 0.5625 \times 22.990 = 12.9\;\text{g}$ .

(2 sig. fig. as in the volume of the H₂ gas.)

6 0

3 years ago

Hey what's the value of pi till<br>5 digits after decimal

puteri [66]

Answer:

Pi to 5 decimals is 3.14159-

Brainlist pls!

P.S. It's a repeating number, but you can just put a (-), so that you don't have to type the whole thing out.

4 0

3 years ago

Read 2 more answers

How many moles are dissolved in 1.5 L of a 5.7 M solution?

Scrat [10]

Answer:

8.55 moles

Explanation:

The formula for calculating molarity is moles of solute divided by liters of solution. In this case:

$5.7=\frac{x}{1.5}$

$x=5.7\cdot 1.5=8.55$ moles. Hope this helps!

4 0

3 years ago

Read 2 more answers