The atomic mass of an element is equal to the number of:

find the mass of h2 produced Binary compounds of alkali metals and hydrogen react with water to produce H2(g). The H2H2 from the

scZoUnD [109]

Answer: Mass of hydrogen produced is 0.0376 g.

Explanation:

The reaction equation will be as follows.

$NaH(aq) + H_{2}O(l) \rightarrow H_{2}(g) + NaOH(aq)$

Now, formula for total pressure will be as follows.

$P_{total} = P_{H_{2}} + P_{H_{2}O}$

Hence, $P_{H_{2}} = P_{total} - P_{H_{2}O}$

= 755 mm Hg - 42.23 mm Hg

= 712.77 mm Hg

$P_{H_{2}} = \frac{712.77 \times 1 atm}{760 mm Hg}$

= 0.937 atm

Now, we will calculate the moles of $H_{2}$ as follows.

$P_{H_{2}}V = nRT$

$0.937 atm \times 0.505 L = n \times 0.0821 \times 308.15 K$

n = $\frac{0.473}{25.29}$ mol

= 0.0187 mol

Therefore, mass of $H_{2}$ will be calculated as follows.

$m_{H_{2}} = \frac{0.0187 mol \times 2.0158 g}{1 mol}$

= 0.0376 g

Thus, we can conclude that mass of hydrogen produced is 0.0376 g.

7 0

3 years ago

When current increases and resistance remains constant what must happen to voltage?

katovenus [111]

current increases.

hope this helps!

(:

8 0

3 years ago

Read 2 more answers

Identify the following reaction:<br> deuterium<br> neutron

Darya [45]

Deuterium:also known as heavy hydrogen) is one of two stable isotopes of hydrogen (the other being protium or hydrogen-1). The nucleus of a deuterium atom,called a deuterium,contains one proton and one neutron,whereas the far more common protium has no neutron in the nucleus.

4 0

3 years ago

The model of the atom where the central core contains protons and neutrons surrounded by a cloud of electrons is best described

WITCHER [35]

I am thinking the answer is B. I think this because Bohr had a model similar, but his was lacking the cloud of electrons. His just had electrons orbiting the nucleus.
I hope this is right!<span />

4 0

4 years ago

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What mass of CO2 would be needed to weigh out to make 10.5 moles of carbon dioxide? (round answer to nearest tenth)

melamori03 [73]

The mass of carbon dioxide that would be needed to weigh is 462 grams.

Given:

10.5 moles of carbon dioxide.

The periodic table

To find:

The mass of carbon dioxide would be needed to weigh out to make 10.5 moles of carbon dioxide.

Solution: