$Molar{Mass} H_{2}O_{2} =2*16.0+2*1.0= 34.0 g/mol

42.0 g H_{2}O_{2}* \frac{1 mol H_{2}O_{2}}{34.0 g H_{2}O_{2}} = 1.24 mol H_{2}O_{2}

2H_{2}O_{2} --\ \textgreater \ 2 H_{2}O +O_{2}
\\2 mol ----2 mol (from// reaction)

\\1.24 mol ---1.24 mol (from the problem)

Answer: 1.24 mol H_{2}O.$

3 0

3 years ago

3. How many molecules are in 0.025 moles of CH4?

Ann [662]

Answer:

f455

Explanation:

i dont know

5 0

3 years ago

When pbi2 is added to na2co3 a white precipitate is formed. the white precipitate most likely is?

Alina [70]

The reaction between the lead iodide, PbI2 and sodium carbonate, Na2CO3, will form the chemical compounds, sodium iodide and lead carbonate as shown below.
PbI2 + Na2CO3 --> NaI + PbCO3
The white precipitate formed in the reaction is PbCO3.

8 0

4 years ago

Read 2 more answers

Stars, such as our sun, use fusion to combine hydrogen atoms into helium atoms, and in the process, create energy. As massive st

Zinaida [17]

Hey there! The answer to your first question is SILICON, Nickle has 28 protons, silicon has 14, 14+14=28. Its the only element thats adds up. I dont know about the 2nd one myself.

4 0

3 years ago